Superman is the target of Lex Luthor's deadliest scheme. The cruel genius has poisoned criminal John Corbin. He withholds the antidote until Corbin makes a promise: he will let Luthor turn him into a robot powered by kryptonite. But once the creature named Metallo discovers that he is more machine than human, revenge fills his strange heart
When Lex Luthor uses a device to shrink them down to the size of ants, the Super Friends must use their superpowers to escape from animals now bigger than them, stop Lex from taking over Metropolis, and return to their normal sizes