|Appearances||The Sea of Monsters|
As the Laistrygonians began to destroy the gym with flaming dodgeballs, Mr. Bonsai tried desperately to get the locks on the door to open. Once the giants were all destroyed, Mr. Bonsai managed to get them open and rushed in with half the faculty and a couple of police officers. When Matt Sloan saw Mr. Bonsai enter, he immediately blamed the destruction of the gym on Percy, which Coach Nunley unknowingly agreed to. After looking at the burning room, he questioned Percy on how all this happened. Percy ran from the scene with Tyson and Annabeth Chase and Mr. Bonsai expelled Percy because he had an "un-groovy karma that disrupted the school's educational aura". However, Chiron managed to manipulate the Mist so that Mr. Bonsai wouldn't blame Percy for the explosion.