"The intergalactic bounty hunter Lobo has his sights set on the Man of Steel. Join Superman as he leads the villain to Mercury to thwart his evil plans, and along the way learn real-world science facts about the closest planet to the Sun"--
"Join Superman as he takes Doomsday to the very edges of our solar system, and along the way learn real-world science facts about Neptune, the farthest planet from the Sun"--
A spaceship from planet Warworld approaches Venus, and Superman learns about the planet from Professor Hamilton of S.T.A.R. Labs before going there to face the gladiator, Draaga.