The story of Ben Tennyson, a typical kid who becomes very atypical after he discovers the Omnitrix, a mysterious alien device with the power to transform the wearer into ten different alien species.

Grandpa Max Tennyson: Being a hero isn't about letting others know you did the right thing, it's about you knowing you did the right thing.
Ben Tennyson: What were you just doing, reading greeting cards back at the Mega Mart?
Grandpa Max Tennyson: Well... yes.