The Cactus Monster is the main antagonist from the episode Night of the Cactus! He is mutated by exposure to the meteor's space-juice and kidnaps Zalga. While holding her captive, he falls in love with her and tries to show his affection in various ways, like dancing and shooting food for her with his shootable spines. He attacks The Aquabats when they try to take Zalga from him, but is ultimately destroyed by her when she uses science on him. At the end of the episode, Zalga is seen taking the un-mutated cactus back home with her.