Inseparable, Krypto the Super Dog and Superman are two best friends who share the same superpowers and fight crime in Metropolis. When Superman and the rest of the Justice League are kidnapped, Krypto must convince a group of stray animals – Ace the dog, PB the pot-bellied pig, Merton the turtle and Chip the squirrel – to harness their newfound powers and help him save them on superheroes.