In Captain Carrot and His Amazing Zoo Crew!, it was established that Wonderland and Oz are their own universes in the pre-Crisis DC multiverse (and, unlike other universes shown in one-panel gags, were interacted with extensively by the Zoo Crew and, oddly, Gorilla Grodd). These beloved storybook worlds were thus among those to meet a horrible fate in Crisis on Infinite Earths. Only now, decades later, do these worlds exist again as real places characters could conceivably visit.
