Ben 10 tells the story of Ben Tennyson (got lucky with that name, huh, buddy?) who stumbles across an alien watch that allows him to change into 10 different superpowered aliens. It's all pretty standard little kid power fantasy stuff, and only disturbing if you think about the implications. So don't!
The Original Character:
Ben 10 lifted its entire premise from the 1966 DC Comics series Dial H For Hero. About the only thing they didn't steal was the main character's terrible catchphrase, "Sockamagee," which was stupid even by 1966 comic book standards.
The comic revolved around Robby Reed, a boy who stumbles upon an alien device that allows him to change into superpowered forms. However, in his case, they were all B-list superheroes like "King Kandy" (literally just a guy wearing striped long-johns and a goddamn birthday cake for a hat), "Giant Boy," and the testicle-headed "Future Man."
His future involved blue balls and dying alone.
Robby's thingamabob resembled a rotary phone instead of a watch, but other than that, all the same shtick: For example, Ben's Omnitrix watch often malfunctions, and turns Ben into random aliens -- presumably to keep the episodes from being three minutes long. The same thing was achieved in Dial H For Hero, by making the phone-superpowers random in the first place. So every time he used it, Robby just closed his eyes and prayed it didn't speed-dial "snail dicks for eyes guy."
The face of a pervy teen that's going to keep re-dialing until he turns into a hot chick he can self-ogle.