Asked to investigate a suspicious spacecraft, Superman finds that the supercomputer Brainiac has arrived bent on absorbing all knowledge in the Earth's computers--and then destroying the planet.
"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"--
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.