An alien wreaks havoc on Earth then vanishes into thin air, but Superboy and Krypto are hot on his trail. They travel to the alien's home planet to stop the impending invasion.
A millionaire wants to experience laughter just once before he dies and he's willing to give a million dollars to the charity of anyone who can grant his wish, including Superboy.
Superboy innocently takes a decorative black sphere from the Earth's core, but the sphere is more than it appears to be and Superboy has to save the day before the town is destroyed.
A professor's experiment to help animal species grow and develop more quickly backfires when a baby elephant reverts back to an Ice Age mastodon. It's up to Superboy to stop the out of control creature.