The Legion of Super-Pets is a Fictional team of Super-powered Pets in the Pre-Crisis DC Universe. Members included Krypto the Super-Dog and Streaky the Supercat. The team first appeared in Adventure Comics #293 (February 1962), though most of the members had appeared in earlier issues.
Significant appearances during the Legion's Adventure Comics run include Adventure #323 (August, 1964) in which Proty II is initiated onto the team, Adventure #343 (April, 1966) in which the Super-Pets help the Legion battle the Luck Lords, and #364 (January, 1968), "The Revolt of the Super-Pets!" The team only rarely appeared after the Silver Age of Comic Books and have not made any appearances Post-Crisis, though Krypto has become a supporting character in the Superman titles.
The alien creatures known as the Brain-Globes of Rambat decided that, in order to succeed in their plan to move Earth to their own Solar system, they must defeat Superboy. When they were unable to gain control of Superboy, they summon Cosmic Boy, Lightning Lad, and Saturn Girl of the Legion of Super-Heroes from the future and mentally command the trio to capture him.
After Superboy is defeated, the Brain-Globes of Rambat release their hold on the Legionnaires. When they notice that the Brain-Globes cannot control animals, the Legionnaires gather Krypto the Super-Dog (from Superboy's present), Streaky the Supercat and Beppo (comics) the Super-Monkey (from Superman's present), and Comet (DC Comics) the Super-Horse (from a few weeks in Superman's future) to battle the aliens. The pets defeat the aliens and are named the Legion of Super-Pets, the animal branch of the super club. They are then returned to their proper time periods. Proty II would later join the team.
Beppo and Comet appear in issue #6 of the Krypto the Superdog comic.