Gaea is the primordial god of the earth and the mother of the Titans and the Gigantes. During the time that Uranus was king of the known world, Gaea became unhappy with his rule after he cast her various children into the pits of Tartarus. As a result, she asked her children to overthrow him, but only her youngest child Kronos agreed to do it. After Kronos defeated his father and took the throne, Gaea was appalled when he took the same path as his father and tossed anything he deemed unfit into Tartarus. Gaea turned to her grandchildren, the gods, to defeat Kronos and they eventually did, splitting up the realms of the world as they seemed fit.

Gaea was unhappy with their rule and bore another group of children with Tartarus, called the Gigantes. Each Giant was specifically born to defeat one of the Olympians, but with the help of the gods' children, they eventually defeated the Giants and Gaea went into a deep sleep.

In The Heroes of Olympus series, Gaea once again returns as the main antagonist. Still angry with the way the gods rule the world, she made plans to once again destroy the gods, going as far back as World War II when the gods were fight amongst themselves. She used a young girl named Hazel Levesque, who had the power to raise precious metals from the Underworld, to bring the first of her children back. Her plans were delayed however when Hazel sacrificed herself in order to bury Alcyoneus back in the earth. This only delayed Gaea as her children began to rise one by one and took action after the events of the Second Olympian War.

Gaea is one of the most powerful beings in existence. Her realm of power is the earth itself and there are few places her influence doesn't touch, such as the sea and sky. However this power comes at a price, as Gaea is so powerful that she is rarely fully conscience and takes a long time to wake up. Even during The Heroes of Olympus series, she is not yet fully awake. Gaea is also somewhat manipulative, as she constantly visits the seven of the prophecy and plagues them with doubts about themselves. With the odds stacked against the demigods, only time will tell if Gaea will ever be truly defeated.

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Medusa (in Ancient Greek: Μέδυσα) is a monster who can petrify people to stone if they look her directly in her eyes. She was portrayed by Uma Thurman in The Lightning Thief.

She is a daughter of Phorkys and Keto and was once a priestess of Athena. After Medusa and Poseidon desecrated Athena's virgin temple, Athena cursed Medusa and her sisters. Her hair was turned to snakes and anyone who would look upon her gaze would turn to stone. She was once a beautiful woman before Athena cursed her. Her only company are her statues. She had a child with Poseidon, Chrysaor, who was born from her neck, and another child, Pegasus, in some myths; though others say Pegasus was born from Poseidon and Demeter, who was born from her blood when Perseus beheaded her.

In a late version of the Medusa myth told by the Romans, Medusa was originally a ravishingly beautiful maiden, "the jealous aspiration of many suitors," priestess in Athena's temple, but when she and Poseidon were caught together in Athena's Temple, the enraged Athena transformed Medusa's beautiful hair to serpents and made her face so terrible to behold that the mere sight of it would turn onlookers to stone. Perseus describes Medusa's punishment by Minerva as just and well earned.

Posing as a Middle Eastern old lady named Aunt Em (Aunty "M"), Medusa lures people into her "Emporium" and then turns them into statues by making them look at her face, usually directly at her eyes. She wears a veil to hide her face, and would trick people into looking at her face by pretending to take a photo of them and lifting the veil to uncover her head. At one point, Percy Jackson, Annabeth Chase, and Grover Underwood are lured into the shop by the smell of food during their Quest. Medusa feigns kindness, by giving them food and talking to them about her shop. She also mentions that her sisters are gone (they faded because people forgot about them, like Cottus and Gyges), but then attempts to turn them into statues. Annabeth and Grover realize who Medusa really is and try to get Percy to let them leave. Percy, however is under Medusa's spell and keeps them from going. Percy only figures out that "Em" means M for Medusa when it is too late to escape. After a long struggle, Percy defeats Medusa by severing her head with Riptide, his celestial bronze sword. He then sends the head to Olympus via the Hermes Express. Her severed head is later used by Percy for several other purposes such as giving it to his mom, who later uses the head to turn Gabe Ugliano to stone. Medusa had turned many people and creatures into statues, including Grover's Uncle Ferdinand. Grover mentioned the statue looking like his uncle from the start, but did not realize that it was actually him until Medusa revealed herself.

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Luke Castellan is a Greek demigod, the son of Hermes and the mortal May Castellan. He was one of the main antagonists of the Percy Jackson and the Olympians series. He was tricked by the Titan Kronos into hosting his spirit. Although he is considered as the series' main mortal antagonist, he died at age twenty three as the hero of the Great Prophecy. He is portrayed by Jake Abel in The Lightning Thief. Abel will reprise his role in The Sea of Monsters while Samuel Braun has been cast to play a young Luke in the film.

Luke was a son of Hermes and May Castellan, a female mortal who can see through the Mist. When he was nine years old, Luke ran away from his mother's home in Westport, Connecticut because of her unstable mental problems brought about by the curse of Hades, which was placed upon the Oracle, who she had tried to host. He traveled for years alone, making mortal and demigod friendships that never lasted long, while only having a golf club for a weapon, as his Celestial Bronze sword was melted in acid.

When he was fourteen Luke found Thalia Grace in a dragon's cave near Los Angeles after she had followed Zeus's sacred goat, Amaltheia, there. Together, they had traveled across the United States, battling monsters (and even a couple of automatons at one point), fending for themselves, until, one morning, they had reached Richmond, Viriginia, where once again, Thalia was in pursuit of Amaltheia. Luke seemed to have a crush on Thalia and just couldn't tell her no, even though he knew it was against his better judgement. The goat directed them to an old mansion and once inside (Luke's handiwork) they discovered it was a deadly trap. They met Halcyon Green, a demigod son of Apollo, who had been imprisoned inside the mansion, unable to speak, because he had saved a girl's life in his youth, with his abilities to see into the future, incurring the wrath of the gods. A part of Hal's curse was also to bring in demigods to be eaten by three leucrotae at at sunset. Luke was angered that the gods would do this to Hal and wanted to find a way to rescue him and Thalia. Hal told them that every demigod thought that at first, that they could escape, but soon realized it wasn't possible. Hal told them of a treasure that was in the mansion, assuming they came there for it, but they hadn't. They went after it anyways. Luke was magically able to break the lock, and Thalia was able to claim the Aegis bracelet as a sign from Zeus as he had a shield very similar. 

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Romance appears in several ways in the Percy Jackson and the Olympians and The Heroes of Olympus series.

Percy Jackson and Annabeth Chase
Throughout the series, Percy Jackson and Annabeth Chase have shown many romantic feelings for each other; mainly in The Last Olympian and The Battle of the Labyrinth, though Annabeth shows it more than Percy, and Percy thinks about it instead.

The Lightning Thief

When Percy wakes up he describes Annabeth as a "pretty girl, her blond hair curled like a princess'." During their quest, Annabeth and Percy both feel awkward at stepping into the tunnel of love. They eventually go in, which leads to Percy saving Annabeth from the spiders that are part of the trap designed by Hephaestus to catch Ares and Aphrodite.

Later with the help of Ares, the three hop on a truck heading west and Annabeth and Percy talk about the possibility of war between the gods while Grover sleeps. Percy asks her that if the gods do go to war, would Poseidon and Athena be on opposite sides like they were during the Trojan War. Annabeth admits she doesn't know, but would fight along side Percy regardless as they were friends, before asking if he had any more stupid questions.

When going into the Underworld in the boat, Annabeth takes hold of Percy's hand to make sure she's not the only one alive and Percy said he normally would've been embarrassed, but he wasn't at the time.

Annabeth admits at sixteen that she had a crush on Percy at the age of twelve.

The Sea of Monsters

Annabeth begins to show slight feelings for Percy (and vice-versa; though, more Percy is less than Annabeth- for now). Percy was shocked when he saw Annabeth with make-up on C.C.'s island and thought he would be tongue-tied if he weren't a guinea pig. She hugged him when he changed back to human, cried on his shoulder while hugging him underwater (after he saved her from the Sirens). At the end of the book, she kisses him on the cheek following their success at the chariot race.

The Titan's Curse

Percy and Annabeth dance in the beginning, with Percy being nervous and "tried to focus on little things- the streamers, the punch bowl- anything but the fact that Annabeth is taller than me, my hands are probably sweaty and gross, and I'm stepping on her toes".

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Grover Underwood is a satyr and a friend of Percy Jackson and Annabeth Chase. He's the satyr who found Thalia Grace, Nico and Bianca di Angelo, and Percy. He is currently the Lord of the Wild. Grover is portrayed by Brandon T. Jackson in The Lightning Thief.

Not much is known about Grover's past before he met Percy, but Grover is a young satyr and spent his time as a protector (like most satyrs). However, because he was not granted a Searcher's License before bringing Percy back to camp, he may not have had a completely successful quest to bring back demigods. At one point, he ran across Thalia, Luke, and Annabeth traveling together and tried to get him back to camp while at the same time avoiding the forces of the Underworld . Hades, after learning that a child of Zeus had been born sent hellhounds after her. Along the way, Grover made a few wrong turns which led them into danger with other monsters, including a cyclops that gave Annabeth a fear of the species for a long time. While Grover claims it is his fault that they kept making wrong turns, Thalia later tells Percy Luke was the reason as he kept looking for fights with monsters as he was angry with his father, who he had met at his mother's home. As they came close to the edge of Camp Half-Blood, Thalia held back and told Grover to take Luke and Annabeth back to camp. He did as he was told and got the two back to camp, but at the cost of Thalia's safety. Grover was later assigned to Percy's school and spent enough time with him to know he was a demigod. He eventually called in Chiron who took the form of Percy's Latin teacher.

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The winter solstice is the solstice that occurs in winter. The wintertime meeting between the gods of Olympus is held during the solstice. It is the darkest day of the year which always occurs on December 21st. The winter solstice is the day of the year when ancient, evil magic is at its strongest. This is the only time when Hades can visit Olympus.

During the winter solstice, the Master Bolt was stolen from Zeus by Luke Castellan. Luke was on Mount Olympus with some campers from Camp Half-Blood, so he had an alibi. He snuck into the throne room and stole the Master Bolt from Zeus and the Helm of Darkness from Hades. He found the theft incredibly easy, stating "The Olympians are so arrogant; they never dreamed someone would dare steal from them."

During the winter solstice meeting the Olympians discuss the threat of their father, Kronos, and how best to deal with him. They hold a vote on whether they should take action or not.

Artemis, the goddess of the Hunt, had been captured by Atlas, and she is essential in the voting process, as she understands what kind of a threat Kronos poses.

Percy, Thalia, and Grover manage to rescue Artemis, and she brings them to Mount Olympus, just in time for the voting. The gods vote in favor of action, not destroy the Ophiotaurus, and not destroying Percy and Thalia. At this meeting, Thalia joins Artemis' Hunters, partially in order to escape from the Great Prophecy as her 16th birthday was the next day.

Strangely, Hades is not present, even though the winter solstice is the only time of the year he is allowed to visit Olympus.

The winter solstice is the deadline to save Hera from her cage since the gods would end in chaos fighting themselves without her "motherly figure" and Porphyrion would be released from Tartarus.

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Reyna is a Roman demigod daughter of Bellona, younger sister of Hylla, and Praetor of Camp Jupiter.

Reyna and her older sister Hylla were born to the goddess Bellona. Reyna was originally from Puerto Rico. They used to live at C.C.'s Spa and Resort ran by Circe. Their home was destroyed during The Sea of Monsters by Blackbeard and his crew of pirates when Percy and Annabeth accidentally transformed the pirates back into humans using Hermes' multivitamins. According to Reyna, the pirates destroyed the island and took revenge on C.C. (Circe). Reyna and Hylla, being daughters of Bellona, learned to use weapons very fast and managed to escape from the island and the pirates after being held captive. Eventually, the two sisters went their separate ways. Hylla went and became an Amazon Queen, while Reyna found Camp Jupiter and eventually became a praetor, along with Jason Grace at a time.

As praetor, new arrivals of the camp are required to meet with her. Nico appeared before Reyna and asked her to allow Hazel to become part of the Legion, which Reyna accepted. Frank also met with her and apologized for the acts of Shen Lun, his great-grandfather, who supposedly caused the 1906 San Francisco earthquake. Reyna however told Frank to never mention to anyone who his great-grandfather was, but she let him into the camp. When Percy arrived at Camp Jupiter, she pretended not to know him, even though she saw him at C.C.'s Spa and Resort. During her time as praetor, she and Jason started to form a close relationship, but Jason vanished forcing Reyna to lead the camp by herself, after which she was pestered by Octavian, a descendant of Apollo, to hold elections for a new praetor. She agreed to, but only at the Feast of Fortuna, but it never happened because during the battle that day, Percy was raised to praetor.

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Hades (Άδης in Ancient Greek, meaning "Unseen") is the Greek god of the dead, wealth, and the Lord of the Underworld. One of the Big Three gods, his wife is Persephone. Hades' Roman counterpart is Pluto and he is portrayed by Steve Coogan in The Lightning Thief (film).

Hades is the eldest child of the Titans, Kronos and Rhea as the first of their children. He was consumed immediately after birth by Kronos who was paranoid that he would be overthrown by one of his own children. Hades thus spent his childhood in his father's stomach along with his brother, Poseidon, and his sisters: Demeter, Hera, and Hestia. During the Titanomachy, he proved to be a ferocious warrior and greatly aided in the ultimate downfall of Kronos and his followers. Although it was Hades' birthright to be named his father's successor, he agreed to divide the Titan King's former domain with his brothers and acquiesced, albeit resentfully, to taking the Underworld as his prize.

Although he distanced himself from his family, Hades was lonely and wanted a wife to fill the void. One day, he spotted a young goddess named Persephone, the daughter of Demeter, whose great beauty and tender countenance won his admiration. Hades decided to take her as his bride despite his estrangement with her parents and his siblings, Demeter and Zeus. Hades secretly received Zeus' blessing but he knew that their overprotective sister would refuse to even consider the marriage and so promptly kidnapped Persephone. He then proceeded to woo the distressed goddess with gifts but eventually won her heart through empathy and kindness.

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Thalia Grace is the Greek demigod daughter of Zeus and the sister of Jason Grace. She was transformed into a pine tree on Half-Blood Hill, which still stands as the official border for Camp Half-Blood to this day. Later she was revived with the Golden Fleece. She is currently the lieutenant of the Hunters of Artemis.

Thalia is the daughter of Zeus and Ms. Grace, a beautiful actress in her prime, but who had spiraled into alcoholism in later years. After Thalia's birth, Zeus left the Grace household (as is custom for gods) and Ms. Grace became unstable. When Thalia was about seven, Zeus returned in his Roman aspect, Jupiter. Thalia noted that Zeus in his Roman form was more fatherly and sterner towards her and spoke Latin very often. Within the year, Jason Grace, a Roman demigod, was born. Zeus felt obliged to keep appearing at Ms. Grace's house to please her, but departed a second time because she persisted him incessantly to grant her eternal beauty or a visit to Olympus. When Thalia was nine and Jason was two, their mother took them for a picnic, but when Thalia went to the car for the picnic basket, Hera/Juno took Jason away to Lupa, a she-wolf at Camp Jupiter. Thalia was heartbroken by her brother's "death" and called his disappearance "the last straw" with her mother and ran away from home, never to return, being this the reason why she only uses her mother's last name (Grace) only when it's extremely necessary.

After running away, Thalia came across another demigod, Luke Castellan, a son of Hermes. They became friends and joined forces to fight the monsters that attacked them. It is hinted that they had romantic feelings for each other. When Thalia was twelve, she and 14-year-old Luke found/ran into Annabeth Chase, a plucky blonde-haired seven year old. Luke admired her courage, and gave her his knife, and promised that he wouldn't fail her like her family had. The three of them stayed in different safe houses for protection and shelter, but when their nearest one was destroyed, and Thalia had an injured leg.Luke was forced to return to his home for supplies. The three of them met May Castellan, Luke's mother, and Hermes, Luke's father. As May bandages Thalia's injured leg, Luke and Hermes got into an argument, causing Luke to storm out of the house with Annabeth and Thalia following not too far behind.

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The Heroes of Olympus: The Demigod Diaries is set to be released August 14, 2012 and is the companion book to the one of the main series The Heroes of Olympus. Rick Riordan officially announced the book on January 9th, 2012 on his blog. His son, Haley Riordan has written a short story in the book.

"What dangers do runaway demigods Luke and Thalia face on their way to Camp Half-Blood? Are Percy and Annabeth up to the task of rescuing stolen goods from a fire-breathing giant who doesn't take kindly to intruders? How exactly are Leo, Piper, and Jason supposed to find a runaway table, dodge a band of party-loving Maenads (who just might be a little psychotic), and stave off a massive explosion...all in one hour or less?

"With his trademark wit and creativity, Rick Riordan answers these questions and more in three never-before-seen short stories that provide vital back-story to The Heroes of Olympus and Percy Jackson and The Olympians books. Original art, enlightening character interviews and illustrated profiles, puzzles, and a quiz add to the fun in this action-packed collection that is sure to delight legions of loyal fans."

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Perseus "Percy" Jackson (Περσεύς or Περσέας Τζάκσον in Ancient Greek) is the main character and the narrator of the Percy Jackson and the Olympians series as well as one of the main characters in The Heroes of Olympus series. He is a demigod son of Poseidon and Sally Jackson. He is currently Annabeth's boyfriend and a Praetor of the Twelfth Legion at Camp Jupiter. He is portrayed by Logan Lerman in The Lightning Thief.

Perseus "Percy" Jackson was born on August 18, 1993. He was raised by his single mother, Sally Jackson. When Percy was a baby, his father, Poseidon, left to protect him and his mother. However, Poseidon visited him when he was in his cradle, which Percy described as a "golden glow" and his father's warm smile and a hand on his head. When he was a toddler, his mother married Gabe Ugliano, whom Percy hated. Strange things often happened around Percy. For example, in preschool, one of the preschool teachers put him down for a nap, not realizing a snake was in the bed. Percy eventually strangled it to death with his bare hands. While he was in early elementary school, a large man followed Percy around when he was at school, but the teachers eventually got the man to leave. However, nobody believed him when he said that the man had one big eye. When he was in fourth grade, he accidentally hit the wrong button on the catwalk when his school was visiting Marina World Shark Pool and made his class take an unplanned swim. Then in fifth grade, he accidentally fired a war cannon which hit the school bus. Percy commented that he was expelled from six schools over the course of six years.

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Dionysus (Διόνυσος in Ancient Greek) is the Greek god of grape-harvest, wine, ritual madness, and ecstasy as well as theater. He is also known as Mr. D, the camp director of Camp Half-Blood. He was placed as the director by his father Zeus as punishment for chasing after an off-limits nymph. His Roman counterpart is Bacchus. Dionysus is portrayed by Luke Camilleri in The Lightning Thief.

Dionysus was often called the 'twice born' because of the two myths around his birth. The most common is that his mother was a mortal woman named Semele, who was a daughter of the King of Thebes, and his father was Zeus. This makes him the only Olympian to have a mortal parent, and according to some traditions the only one to have been born a mortal.

As with most of Zeus' acts of infidelity, Hera became jealous when she found out that Semele was pregnant with Zeus' child. She disguised herself as a nurse (or old crone in some stories) and made Semele begin to doubt that it was truly Zeus. While in disguise; Hera convinced Semele to ask Zeus to reveal his true form and, to make sure that he would do it, to swear on the River Styx, which is sacred to the Greek Gods and an unbreakable oath. Zeus tried to get around the promise, but in the end swore on the River Styx, and Semele asked to see his true form. Unable to go back on the promise, he did so, and she was burned to ashes. Zeus managed to save the infant, sewing him into his thigh until he was born a few months later as a full grown baby on Mount Pramnos in Ikaria. He was born a demigod, like Hercules and Perseus.
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Polyphemus (Πολύφημος in Ancient Greek) is a blind Cyclops, son of Poseidon and sea nymph Thoosa, who inhabits an island in the Sea of Monsters. He stole the Golden Fleece in order to make it easier for him to eat, meaning that the Golden Fleece has a natural-smelling scent (which gives off the same, if not extremely similar scent) of the nature god Pan. Satyrs would try to find Pan and since the Labyrinth blocked off any scent of Pan, the only thing giving off his scent would be the Golden Fleece. So satyrs searching for Pan would travel to Polyphemus' island, but instead they would be trapped there and be eaten by him. He will be portrayed by Robert Maillet in the film adaptation of The Sea of Monsters.

Polyphemus was a character in Homer's The Odyssey. When Odysseus stopped at the island of the cyclopes, he saw a cave and thought there might be food in it. He and some of his crew went to investigate. His sailors insisted on taking what was there and leaving, but Odysseus insisted on meeting the 'person' who owned it all, thinking he would present a challenge to them.

At sundown, Polyphemus let his sheep back into the cave before moving a massive stone to cover the door. When Odysseus and his men try offering him some of their food, he instead grabs two of the men, tears them apart, and eats them. He asks Odysseus what his name is, and the clever hero tells him his name is Nobody (Nobody). Odysseus then gets Polyphemus drunk on wine and puts him to sleep.

While he slept, Odysseus and his remaining men took a large stick and sharpened the end of it (in some versions they charred it too), and stabbed it into Polyphemus' eye. The monster woke with a start and called for his brothers, but all he said was 'Nobody has blinded me!', and so they thought he was merely stating the obvious and left him alone.

Later, when Polyphemus lets his sheep out to graze, he reaches down and feels around them to make sure Odysseus and his men aren't on their backs. However, Odysseus tied himself and his men to the sheep's undersides and were able to escape. As they left the island on their ship, Odysseus bragged to Polyphemus that he had escaped and in his boldness told the cyclops his real name. This allowed Polyphemus to ask to Poseidon to curse Odysseus, which served as yet another setback on his journey home.

Sometime after this, Polyphemus stole the Golden Fleece and hung it on a tree on his island (what happened to the other cyclopes on the island is unknown; it's possible they moved to different islands). Along with making his island a paradise, it lured satyrs there in search of Pan, the wild god, whom Polyphemus would simply eat.
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Hera (Ήρα in Ancient Greek, meaning "Lady of the House") is the Greek goddess of air, familial love, heaven, marriage, motherhood, and women. She is the elder sister and wife of Zeus, therefore making her Queen of the Gods. She is one of the daughters of Rhea and Kronos. Her Roman counterpart is Juno. Hera is portrayed by Erica Cerra in The Lightning Thief.

Hera spent her childhood in her Titan father Kronos', stomach after she was born by Rhea, her Titan mother. Zeus, the youngest child, rescued her and her siblings by making Kronos throw up, and after the First Titan War (also known as the First Titanomachy) ended, she married him and became the Queen of the Gods. After accepting Zeus, Gaea gave Hera the golden apples of immortality as a wedding gift, which she placed in her garden at the western edge of the world. Hera employed the Hesperides, daughters of Atlas, to guard the tree, but as the nymphs would occasionally pluck an apple from the tree themselves, she also put a one hundred headed dragon named Ladon there as well. This orchard was later named The Garden of the Hesperides. Over time, Zeus was very unfaithful to her, and had many children with mortal women such as Jason Grace, Thalia Grace, and Hercules. This, understandably, frustrated Hera to no end, and she devoted most of her time to keeping Zeus in sight, as well as making the lives of the mistresses and illegitimate children miserable. Her hatred is most evident in the story of Heracles, whom she tried to kill repetitively, and who later ended up as her son-in-law by her daughter Hebe.
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Prometheus (Προμηθεύς in Ancient Greek) is the Titan of crafty counsel and forethought. He is known for giving humans the gift of fire. He is the son of Iapetus and Clymene. Prometheus sided with the gods in the first Titan War because he knew that the Titans would lose. As a result, he was not imprisoned. However, because of his meddling nature, he stole fire for humans, which boosted their progress as a species. Before he'd already deceived the king of the gods making him choose the worst part of an ox and giving the best one to humanity. This two actions (especially the fire issue) made Zeus angry and so as punishment, Zeus had Prometheus chained up on a mountain and had an vulture peck out his liver every day (though Prometheus' liver regrew every night). This would be evaded if either someone breaks the chains or if Prometheus tells Zeus which of his fellow gods would overthrow him. Prometheus was later freed by Heracles who also slew the eagle, with the permission of his father Zeus.

In The second Olympian war, Prometheus joined Kronos in the battle against the gods, and was sent as a messenger by the Titans in an effort to persuade the demigod forces into surrendering. Claiming to have always been an ally of humanity, he tells Percy Jackson that he has foreseen their defeat, and asks them to give up their fight. He claims that the gods are just as petty, if not worse, than the Titans and that humanity would benefit from the victory of Kronos.
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The Battle of the Labyrinth is the fourth book of the Percy Jackson and The Olympians series written by Rick Riordan.

The book begins with Percy going to a freshmen orientation class at Goode High School, a school where Paul Blofis, his mom's boyfriend, teaches. While there, he meets Rachel, a clear-sighted mortal whom he met previously at the Hoover Dam in The Titan's Curse, and is attacked by two Empousai, Tammi and Kelli. Percy slays Tammi, but Kelli got away. Unfortunately, Paul Blofis and some freshmen saw the incident. Percy and Rachel escape through a broken window, and Percy, along with Annabeth, make their way to camp.

After arriving in camp, Percy stops by the arena and sees "the biggest hellhound he's ever seen," Mrs. O'Leary. He tries to stab her, but is soon parried by Quintus, the new sword-master, who reveals that Mrs. O'Leary is his pet. Chiron comes over and picks up Percy. He drops him next to Annabeth, Clarisse and a crying nymph, Juniper. Percy soon figures out that Grover has only one week to find Pan, the lost God of the Wild. As soon as he reached the Poseidon cabin, he sees his half-brother, Tyson, cleaning up. Tyson hugs him and had fixed his broken shield
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In Greek mythology, Hestia (Ancient Greek: Ἑστία meaning "hearth" or "fireside") is the eldest child of Kronos and Rhea. She is the virgin goddess of the hearth, home, the right ordering of domesticity, architecture, and the family. She received the first offering at every sacrifice in the household.

Hestia was the first born child of the Titans Kronos and Rhea. She was the goddess of the hearth and home, and every household in Greece had a sacrificial flame in her honor. Like Hades, Poseidon, and the rest of their siblings, she was swallowed by Kronos, and spent her childhood inside his stomach, until her brother, Zeus, came and rescued her and her siblings. Because she was the first to be born and swallowed and the last to be thrown up by Kronos, she is called both the oldest and the youngest of Kronos' and Rhea's children.

Hestia is first mentioned by Chiron to Percy while discussing the arguments between Zeus and Poseidon, and how she, along with their sisters, Demeter and Hera, could possibly calm them down.

In the final book of the series, it is revealed that the little girl tending the hearth when Percy first arrived at Camp Half-Blood was, in fact, the goddess Hestia. This makes her the first of the Olympian gods that Percy actually encountered but the last to have her identity revealed.(more...)

Calypso (also known as Atlantis in Greek Mythology, Ατλαντίδα in Ancient Greek) is a character who appears for a brief time in The Battle of the Labyrinth. She is described as being kind, down to earth, and even more beautiful than Aphrodite, to Percy.

Although she only made one brief appearance in the series, she was a very important part of Percy's choices he made after he met her, since she was the one who reminded him that he doesn't support the gods because they are good (since most of them aren't good); he supports them because they are all part of his family, much like how she supported her father, Atlas, and the Titans even though they were mostly evil.

The Greek mythological Calypso is described as a lovely seductress. She is the daughter of Atlas, Titan of the West and Lord of Endurance and Tethys, a Titaness and sea goddess. She is described as being a nymph, and also the goddess of the flowing locks.(more...)

Poseidon (Ποσειδῶν in Ancient Greek) is also known as the Earthshaker, Father of Horses, and Stormbringer. He is the Greek god of earthquakes, oceans, seas, and storms. He is the son of the Titans, Kronos and Rhea as well as one of the Big Three. In the series, he is the father of Percy Jackson and the ancestor of Frank Zhang. His Roman counterpart is Neptune. Poseidon is portrayed by Kevin McKidd in The Lightning Thief film.

The fourth child and second son of Kronos by Rhea; Poseidon spent his childhood in his father's stomach along with his brother, Hades and sisters; Demeter, Hera, and Hestia. When Zeus made the Titan king regurgitate his siblings with a mixture of mustard and wine, Poseidon, along with the others, joined his cause and battled against the Titans with a vengeance. They eventually defeated Kronos with Zeus chopping him to pieces with his own scythe. After they won the war against the Titans, Poseidon and his brothers drew lots for the universe with Zeus claiming the sky and Hades receiving the Underworld.(more...)

The Camp Half-Blood is a secret demigod training camp located on Long Island. It is directed by Dionysus (who is called "Mr. D") and Chiron the centaur. It is also the Greek equivalent/counterpart of Camp Jupiter.

The camp has magical borders which are enforced by the Golden Fleece, which was found and discovered by the satyr Grover, the Cyclops Tyson, and demigods Percy Jackson, Clarisse La Rue, and Annabeth Chase. Taken from Polyphemus's island it was placed on Thalia's pine tree, ensuring that no monsters could gain access to the camp. In earlier years it was a pine tree made from Thalia, a daughter of Zeus. After almost being killed by monsters, Zeus felt sorry for her and turned her into a pine tree, making it so she wouldn't die. Her tree became the official borders of Camp Half-Blood. The Fleece stayed on the tree, guarded by a dragon (Peleus), protecting the camp.

The camp is described as being the only safe haven for half-bloods, although in The Lost Hero it is revealed that there is a camp for Roman demigods which is revealed in The Son of Neptune to be called Camp Jupiter.(more...)

The Son of Neptune is the second book in The Heroes of Olympus series written by Rick Riordan. It is set to be released on October 4th, 2011, a week earlier than planned. The story takes place around two months after The Lost Hero.

In an interview by Scholastic with Rick Riordan for The Lost Hero Riordan is questioned about the whereabouts of Percy Jackson. The author hints that the answer would be revealed as Jason's quest progressed. By the end of the book he says that readers would have a good idea where the second book is going. It has led to speculation that the book would explore the events surrounding Percy and his involvement with Camp Jupiter the Roman version of Camp Half-Blood. On May 26, 2011, Riordan released both the cover art and the first chapter of the book confirming such speculation.(more...)