A self-proclaimed, boy genius who built a secret lab in his bedroom which is constantly being invaded by his annoying, older sister Dee-Dee.
Dexter's tall, blonde, ballerina sister. Her favorite past time is to destroy Dexter's Lab or messing with her little brother's head.
Mom from Dexter's Laboratory.
Dad from Dexter's Laboratory.
Dexter's arch rival who is heads over heels for Dee-Dee.
Dexter's computer given a body, Computress serves as his assistant in his new company Dexlabs. She has a noticable crush on Professor Utonium
Dexter's pet and test Monkey in his lab. In secret, he is Monkey, the Earth's greatest hero.
A nephew of Uncle Sam, and the self-elected leader of the Justice Friends and A.W.S.M.
Dee Dee's friend.
Action Hank is a character from Dexter's Laboratory that has a indestructible beard.
A viking god of Ragnarok and roll.
A Justice Friend who uses fire.
An old college roommate of Major Glory, Living Bullet is a man who moves at the speed of a bullet. He's most commonly referred to as the "World's Fastest Man".
Member of the Justice Friends with cat like abilities.
A member of Justice Friends.
Dexter's elementary school teacher.
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