Luke shares a treehouse with his geeky older brother, Zack. Luke goes for a wee and while he's gone an alien gives his undeserving, never-read-a-comic-in-his-life brother superpowers, and then tells him to save the universe! Luke is furious, but when Zack is kidnapped by his arch-nemesis, it's up to Luke and his friends to save the world.

Luke's in his tree house with his older brother, Zack, but he needs a wee.
When he gets back, his undeserving, never-read-a-comic-in-his-life brother has been given superpowers and told to save not one, but two, universes. Luke is OUTRAGED! Zack doesn't even like LIKE comics! But there are worlds to save and SOMEONE has to make sure Zack does it properly. Especially as he won't even wear a cape...