Cosmo seemingly had the same history as his Earth-616 counterpart.

Guardians Team-Up

While on monitor duty, Cosmo was able to evade Rocket Raccoon and steal his beer. Rocket located him and found the canine playing poker with the Pet Avengers. Suddenly, Pet Avengers Mansion was invaded by the Pets of Evil Masters, who kidnapped the Avengers. Rocket and Cosmo followed them to Castle Doom, freed their comrades, and escaped. Later, the two teams would intercept the arrival of Grott the Planet-Slayer.[1]


Seemingly those of the Cosmo of Earth-616.

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