Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.
In "Deedeemensional", Dee Dee time-travels to save Dexter from a monster. In "Magmanamus", Monkey goes up against a lava being that dislikes human-caused noise. In "Maternal Combat", when his mother falls, Dexter creates a robot mom to substitute for her.
Monkey must defend the city from a giant underground lava monster, Magmanamus, who cannot sleep because of the noise created by its residents.
When his mother falls ill, Dexter creates a robot to do her chores. Dee Dee gets hold of its remote control and wreaks havoc, forcing Dexter to create a second robot to counter Dee Dee's.
Dexter is forced to play dodgeball by his P. E. teacher. Constantly failing, Dexter builds a robotic exoskeleton to defend himself.
Intergalactic wrestling champion Rasslor challenges Earth's superheroes, including Monkey, with the planet's fate at stake.
In need of an assistant to operate his latest invention, Dexter performs a brain transplant on Dee Dee to make her smart enough to fulfill the role. With her new brain, Dee Dee proves to be more intelligent than Dexter.
