Inside the Collector's Museum
Cosmo was a specimen from a U.S.S.R. space program and was brought to Taneleer Tivan's museum as a part of his obsession with collecting. When the Guardians of the Galaxy brought the Orb to Tivan, Rocket and Cosmo growled at each other and bared their teeth as Carina told them about Tivan's collection.
- In the comics, Cosmo was a test animal of the Soviet Space program. He was launched into Earth's orbit as part of an experiment in the 1960s but drifted off into space. He later arrived on Knowhere and became mutated, gaining telepathic and telekinetic abilities. The very uneasy relationship Cosmo has with Rocket Raccoon is referenced in the film when they growl at each other as the Guardians enter the museum.
- Cosmo has a cameo in the end-credits sequence of Guardians of the Galaxy Vol. 2.
Behind the Scenes
- Anthony Russo revealed that Cosmo was supposed to appear in Avengers: Infinity War, but he was ultimately cut to focus on the film's narrative.