The first Brainiac/Kandor comic book story in "Action Comics" #242 (July 1958) was based on a story arc in the "Superman" comic strip from April through August 1958. In the comic strip story, Superman's foe was named Romado, who traveled the cosmos with a white alien monkey named 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.