Koko, shrinking major cities and keeping them in glass jars. The strip's Kryptonian bottled city was named Dur-El-Va. This cross-continuity conflict was not unprecedented; in 1958 and '59, editor Mort Weisinger used the comic strip to prototype a number of concepts that he planned to introduce in the book, including Bizarro and red kryptonite.

Brainiac is a bald, green-skinned humanoid