Board Thread:General Discussion/@comment-1013969-20160817151103/@comment-1257201-20160818184325

True, indicated that Kamandi's world was an alternate future of Earth-1. But by the time of Crisis, this explanation had been replaced with a more conventional one: Kamandi's world is one of the multiverse Earths. Eventually this world would be referred to as "Earth-AD".

(I don't know when this term started being used to designate Kamandi's parallel Earth. In Kirby's Kamandi issues, he said the stories took place on "Earth -- After Disaster!", or "Earth -- A.D." for short.  But this merely indicated that these stories took place after the Great Disaster.  It wasn't meant to designate another Earth in the multiverse.)