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Official Site: Marvel

Cosmo the Space-dog ( ) is a fictional character appearing in American comic book published by Marvel Comics. Cosmo, a telepathic Soviet space dog, is the security chief of the space station Knowhere and a member of the Guardians of the Galaxy. The character was created by Dan Abnett and Andy Lanning as a reference to Laika and first appeared in Nova vol. 4 #8 (Jan. 2008).

A female version of Cosmo the Spacedog appeared in a cameo role in the Marvel Cinematic Universe films Guardians of the Galaxy (2014) and Guardians of the Galaxy Vol. 2 (2017), as well as in the Disney+ animated series What If…? (2021). She is voiced by Maria Bakalova in The Guardians of the Galaxy Holiday Special (2022) and Guardians of the Galaxy Vol. 3 (2023).

Cosmo was a Soviet space dog during the 1960s. He was launched into Earth's orbit by the Soviet space program as part of an experiment but was lost in space, arriving in Knowhere and at some point being mutated by cosmic rays, he eventually came to serve as the station's security chief. Cosmo met a distraught Nova shortly after he witnessed Suspensor turn into a zombie. He tells Nova that he's on Knowhere, a city located within the severed head of a giant Celestial. Beings from all over the galaxy come to Knowhere waiting for the end of the universe.

When the Luminals bring something in a large box, the city's population has to go into hiding. The Xandarian Worldmind then informs Rider that he had deciphered the writing on the wall, which is a countdown to a timer.

Cosmo the Space Dog has not been a contender in any CBUB matches.