Krypto was originally bought by Jor-El as a pet for the infant Kal-El on Krypton. However, Jor-El was forced to use Krypto as a test subject in one of his rocket experiments (budget constraints?). Krypto was successfully launched into orbit of Krypton, but a meteor collision knocked his capsule irretrievably into space. When Krypton exploded 58 days later, Krypto's capsule was drawn alsolo with baby Kal-El's rocket.
Krypto was a member of the Space Canine Patrol Agency.
Streaky began as a normal Earth cat, the pet of Linda Danvers a.k.a. Kara Zor-El a.k.a. Supergirl. His powers derive from Kryptonite-X, one of the many varieties of Kryptonite, and one that was produced in a laboratory by Supergirl, who was attempting to find a cure for Kryptonite. However, the Kryptonite-X made Supergirl sick in a way similar to Green Kryptonite. Thus, she disposed of it. Streaky happened upon the Kryptonite-X and was instantly endowed with a full set of Kryptonian powers. The powers granted by Kryptonite-X were temporary, but the chunk of Kryptonite-X somehow ended up in Streaky's yarn ball, making recharging easy. Streaky and Supergirl went years without figuring out where Streaky's powers came from if they ever found out.
Streaky had a descendant in the Legion of Super-Heroes' 30th Century named Whizzy, who also had Kryptonian powers. Whether these powers were natural or the yarn ball was passed down through the centuries is unknown.
Beppo was a Kryptonian monkey (that's some wicked parallel evolution....) who somehow managed to stow away on the rocket that brought baby Kal-El to Earth. Natually, Beppo gained super powers once exposed to Earth's yellow sun and lower than Kryptonian gravity. Apparently keeping a low profile for years, Beppo appeared on the scene during Kal-El's time as Superboy. Beppo used his super-simian powers to cause trouble and mischief, even nearly exposing Superboy's secret identity. Superboy managed to trick Beppo into deep space, and it took the monkey years to return. Upon his return, he was rediscovered by Supergirl. Krypto and Streaky were initially not pleased, though they eventually accepted Beppo as one of them.
Comet began life as a Biron, a centaur in ancient Greece, where he saved Circe the sorceress from an enemy. In gratitude, she offered to grant him a wish. He asked to be changed into a human so that he could court Circe. She cast the spell, but said enemy sabotaged the spell so that, rather than being made fully human, Biron was made fully equine. Circe was able to fix the spell enough that Biron could become fully human whenever there was a comet in the sky. Thus, the name Comet.
Comet was basically a flying horse. However, his powers were magic-based, so Kryptonite affected him as it would a non-Kryptonian, and he kept his powers under a red sun. Comet was an occasional love interest for Supergirl in his human form. In fact, they even ended up married!
In a Legion of Super-Pets story, Comet took human form and joined as Biron the Bowman. However, since there's rarely a comet visible in the sky, his default mode was that of a horse.
| Issue | Date | Title |
|---|---|---|
| Adventure 293 | 2/62 | The Legion of Super-Traitors |
| Adventure 313 | 10/63 | The Condemned Legionnaires |
| Action 309 | 2/64 | The Superman Super-Spectacular |
| Adventure 322 | 7/64 | Super Tests of the Super-Pets |
| Superman 176 | ? | ? |
| Action 323 | 4/65 | ? |
| Adventure 343 | 4/66 | Evil Hand of the Luck Lords |
| Adventure 351 | 12/66 | The Forgotton Legion |
| Adventure 364 | 1/68 | Revenge of the Super-Pets |
| Adventure 380 | 5/69 | The Legion's Space Odyssey |
| Action 387 | 4/70 | One Hero Too Many |
| Legion of Super-Heroes 300 | ? | ? |
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