Alan is a normal tenager, until the most powerful weapon in the galaxy called the Altimatrix stuck itself on his wrist.Now, he can change into 10 different aliens.He can fight crime and must keep the secret about the Altimatrix.This is Alan 10.
Alan - the main character, a normal tenager at age 14, until he gets the Altimatrix.He wears a green T-shirt and long jeans.
Spike - Alan's older brother,takes care of Alan since their parents died in an incident.He is good in baseball.
Uncle Sam - Alan and Spike's uncle.He is a Plumber, but he won't let Alan and Spike know.He is good in shooting and has fighting skills.
Vanglax - He is the main villain.A Chimera Sui Generis alien who wants the Altimatrix.He wants to use the Altimatrix to control the whole galaxy.