Krypto tells the story about how he arrived on Earth and met Kevin. Krypto continues his story, explaining how he became known as Superdog.

A flea from Krypton besieges Krypto when it chews his hide. / Krypto helps save a caterpillar after hungry Ignatius enlarges the bug with a growth ray.

Krypto has his first encounter with the Dog Stars as they try to capture an evil kitten named Snooky Wookums. / Streaky learns a lesson about being a superhero after he gets superpowers from Krypto.

When a teleporter gets stuck in Melanie's diaper, Krypto and Kevin have to save her before Melanie teleports herself into danger. / Streaky feels neglected when Andrea adopts a new cat named Delilah. His jealousy turns to shock when he discovers that Delilah works for Mechanikat.

Kevin and Krypto have to spend a day in each other's bodies when red kryptonite causes their minds to switch. / Krypto becomes Bathound's partner when they chase after Joker's hyenas.

Kevin learns what it's like to be a dog when aliens adopt him as their pet. / When dogs all over the city start acting like other animals, Krypto investigates and discovers that Mechanikat is the cause.