The anthology comic Adventure Comics 283 was published with a cover date of April 1961. In the Superboy segment, the Phantom Zone, Phantom Zone Projector, General Zod, and Dr Xadu were introduced created by Robert Bernstein and George Papp. The issue also marked the end of the Congo Bill/Congorilla being in the back up story in the title. ("Superboy: The Phantom Superboy", "Congorilla: The Lion with the Double Identity", Adventure Comics 283, DC Comic Event)















