The Capricious Crony - S1.E10

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.