Superman; Justice League of America [Green Arrow; The Flash [Barry Allen]; The Atom [Ray Palmer]; Aquaman; Batman]; Topo; Jor-El (flashback); Lara (flashback); Zhan-Zar (flashback)
Aquaman discovers and delivers to Supermen a video recording of Jor-El that tells about several computer predictions he once commissioned to help him choose where to send his son's rocket after the destruction of Krypton. Superman watches it with his Justice League friends and learns that on each of the other possible worlds where his father might have sent him, be becomes a hero just like one of the other Leaguers.
Supergirl (origin retold); Zor-El; Allura; Fred Danvers; Edna Danvers; Comet the Super-Horse (flashback); Supergirl robots; Supergirl Emergency Squad; Dar-Lin; Dick Malverne (cameo); Lena Thorul (cameo)
Now living in Kandor, Supergirl's mother Allura suffers a health crisis because she misses Kara so deeply. Supergirl's adopted parents Fred and Edna Danvers agree to trade places with Zor-El and Allura -- they will live permanently in Kandor so that the Kryptonian family can be reunited on Earth.