The Giants of Doom - S3.E14

Bizarro has created a "giant ray" device that can turn anyone into 100-foot giants and uses it with the Justice League computer to transform himself, Sinestro, the Toyman and Captain Cold into giants. Each of them take over a continent of the world. But there is one catch: the Super Friends, after being helplessly hurled to Saturn, escape from their imprisonment and find out a way to use Bizarro's ray to stop them. Bizarro did not count on the Justice League's computer analysis that Bizarro thought the Super Friends would never be able to return. They unknowingly left traces of elements used by the device to turn Superman, Batman, the Flash and Green Lantern into 100-foot giants to combat their foes.