Justice League of America — DC Comics
Issue: #209
The heroes triumphantly defeat Per Degaton on Earth-2 in 1942 (reverting him to a lowly lab assistant to Prof. Zee in 1947, remembering the events he caused as only another dream), as well as the Crime Syndicate (returning them to their limbo prison in the Earth-3 universe), returning things to normal on both Earth-2 in 1982 and Earth-Prime circa 1962 (with all forgetting this adventure ever happe...
Creators: Roy Thomas, Len Wein, George Pérez, Ben Oda, Gerry Conway, Don Heck, Carl Gafford
Characters: Batman, Superman, Power Girl, Zatanna, Hal Jordan, Aquaman, Barry Allen, Kent Nelson, Red Tornado, Wonder Woman, Black Canary, Green Arrow, Alan Scott, Libby Lawrence, Huntress (Wayne), Elongated Man, Ultraman, Firestorm, Johnny Quick, Owlman
Story arcs: Crisis on Earth-Prime