An alien comes to Earth and causes bizarre and violent weather. When Superboy and Krypto finally stop him, the alien tells them that an invasion is coming. The alien then takes them to his homeworld. Under that planet's red sun, Superboy's powers weaken and he is taken prisoner and held under a transparent dome.

Superboy is freed from his prison when Krypto spills paint over the clear dome trapping Superboy. Superboy's powers return and he heads back to earth to defeat the invading aliens.

Three criminals plague Superboy in Smallville. Whenever Superboy tries to stop the villians, Krypto attacks him. Superboy learns that the criminals have a device that helps them control Krypto. Superboy discovers a way to stop the device by plugging Krypto's ears. Superboy and Krypto, then, work together to stop the criminals.

A deep sea expedition discovers a huge pearl at the bottom of the ocean. When they are attacked by a sea monster they send out an S.O.S. Superboy and Krypto head to the ocean to rescue them, but discover that the sea creature is a dragon that was only attacking in order to protect the giant pearl which is really its egg. When the pearl is stolen by pirates, the sea creature gets angry. Superboy and Krypto capture the pirates and return the egg to the dragon.

A wealthy old man promises to give a large amount of money to anyone who can make him laugh. Clark Kent and Krypto attempt to make him laugh but fail miserably. Later, however, Clark must reveal himself as Superboy to the old man in order to save an airplane that is about to crash. The old man begins to laugh because he thinks that the idea that Clark Kent wants him to believe that he is Superboy is hilarious.

Superboy and Krypto head underground to recover a radioactive rock that can only be found in the Earth's core. When the two discover a strange black sphere, they decide to take it back with them. Unfortunately, a strange crystalline creature follows them to the surface. When it emerges it because to wreak havoc. Eventually Superboy realizes that the black sphere is the crystalline creature's egg. They hatch the egg and take the baby to its mother. No longer angry, the mother returns to the Earth's core with her baby.

When Professor Ames feeds a chemical experiment to an elephant, it turns into a rampaging mastodon. Superboy and Krypto recapture the animal so that the professor can cure it. Unfortunately, one of the professor's assistants does the experiment again. Superboy and Krypto must head to Africa in order to get newingredients for another cure.

Superboy and Krypto capture two aliens who are using a number of devices to create chaos on Earth. When they investigate the aliens they discover a crashed flying saucer and two other unconscious adult aliens. They soon realize that the aliens they captured where the children of the unconscious aliens. The aliens crashed on Earth and the children have been using their toys to cause trouble. Superboy reunited the aliens and help them fix their crashed space ship.

Superboy and Krypto rescue a strange little creature that is shot to the surface by an underwater volcano. Superboy leaves Krypto to watch the creature as he goes off to figure out where it came from. Krypto tries to keep the creature out of trouble but has little success. Superboy eventually finds the creature's home. He returns to Krypto and the two of them take the creature back to his family in the volcano.

Superboy and Krypto find a stash of alien weapons. Krypto accidently blinds Superboy when he inadvertently triggers one of the devices. Krypto must act and Superboy's eyes until Superboy's sight is restored.

When a friend of Clark's finds a magical cape he is sent back in time to Camelot. Clark as Superboy goes back in time to help his friend. Superboy saves him from being trampled by the Black Knight, but is soon forced to duel the Black Knight who is being helped by Merlin. Superboy wins and the Black Knight and Merlin are arrested by King Arthur. Superboy and his friend return to the their own time.

When a flying saucer lands in the desert, the U.S. army prepares to destroy it. Superboy intervenes and asks them to wait. Superboy and Krypto head to the saucer. Upon seeing the powers of Superboy and Krypto, the aliens become convinced that all earthlings may have these powers. They decide to call off their invasion of the planet and head home.

Superboy and Krypto help out at a circus that is being plagued by a number of strange accidents. After a little investigating, they discover that the accidents are bing caused the a former business partner of the circus's current owner.

When Clark is on a field trip to Metropolis, he is alerted by Krypto of an on-coming hurricane. Clark changes into Superboy and he and Krypto prevent the storm from doing too much damage before it heads back out to sea.

Professor Potter gives Superboy a serum that he believes will protect him from Kryptonite. Unfortunately some of the professor's plant growth formula has gotten into the serum and Superboy grows to enormous proportions. Superboy realizes the problem of being a giant when he becomes a danger to those he is trying to help. Eventually Professor Potter comes up with an antitdote and Superboy is returned to his normal size.

Clark dresses up in a devil costume for Halloween. On his way to a party, he spots two criminals and flies toward them. He frightens the criminals into thinking he is the devil and he offers each of them three wishes. Everything they wish for backfires because Superboy cleverly twists their words. Eventually Superboy tricks them into turning themselves in.

Clark and Lana head to a futuristic city that is populated entirely with robots. An evil scientist tries to make the robots attack but Clark, as Superboy, stops him.