After their victory in the Super Secret Crisis War, the Powerpuff Girls take it easy with a rare VIP tour of Dexter's Laboratory! But when tag-along Dee Dee accidentally activates Dexter's newest invention, the fate of the entire multiverse is suddenly at stake! A dimensions-spanning epic into the worlds of Courage The Cowardly Dog, Cow and Chicken, Foster's Home For Imaginary Friends, and Dexter's Laboratory!