Action Comics #576 [Direct]-Fine (5.5 – 7)

EARTH'S SISTER PLANET! / THE "MONUMENTAL" MENACE OF METROPOLIS! Superman battles the leader of a planet that used to be in our solar system where dinosaurs are sentient and dominant. The leader wants to obliterate humanity. His son, however, plots to save the humans, with Superman's help. Superman switches bodies with a young hero from another world to defeat alien invaders.