A sleeping volcano deep beneath the sea erupts and a passenger liner is drawn closer to certain destruction by the powerful vortex created. Superboy and Krypto arrive on the scene and save the ship from destruction. Superboy sees a strange creature emerge from the dwindling waterspout and he and Krypto carry it to land nearby. Superboy asks Krypto to look after the creature as he endeavours to find its origin.
Playing near the Smallville dam, the creature opens the sluice gate accidentally and Krypto rushes in and fixes things and saves the creature with a returning Superboy's help.
Krypto convinces Superboy to give the creature one more chance. Investigating the underwater volcano, Superboy realizes it is the home of a number of creatures just like the one he found.
Playing near a pumping station, the creature causes an underground explosion. Superboy eases the pressure but the creature causes an avalanche on a nearby mountain side. Superboy and Krypto see the creature was buried in the avalanche and fear it was killed. However, the creature is found alive and is returned to his underwater home by Superboy and Krypto.