When the Brain Globes of Rambat threatened to conquer the Earth and move it through space to their home purple sun, the Legion of Super Heroes was helpless. The individual powers of the Legionairres were insufficient to resist the mental influences of the brain globes.

Through the intervention of Krypto, the LSH realised that the Brain Globes could not affect the minds of a Super animal. As there were four Brain Globes menacing the Earth, the LSH selected four super animals from across time to form a so called Legion of Super Pets and defeat them: Krypto, Straky the Super Cat, Comet the Super Horse, and Beppo a monkey who had survived Krypton in an early test rocket built by Jor-El.

Together these "pets" defeated the Brain Globes and the team continued in a semi - official existence.