It’s the ultimate DC Team-up in “Crisis in Eternity.” The full explanation would take too long, so here’s the short version. This was a three-comic story where the heroes of three worlds, Earth-One, Earth-Two, and Earth-S, join forces to take on King Kull (no, not that one) and the villains of all three earths. I had this issue of the series, which introduces the Squadran of Justice (see below), and the third issue, featuring Captain Marvel (Shazam!) battling Superman.
Original collection; Current collection