'Guardians of the Galaxy' (TRAILER): Nathan Fillion May Voice THIS Character In Marvel Film

Nathan Fillion's big "Guardians of the Galaxy" cameo may have leaked online days after his appearance in the franchise was confirmed.

[Warning: the article contains potential movie spoilers]

Schmoes Know reports a source close to the production claims Nathan Fillion take on the role of Cosmo the psychic Russian cosmonaut dog. Like Bradley Cooper and Vin Diesel, the actor will be voicing his animated character.

"Cosmo is a telepathic Russian dog in the Marvel Comics universe," according to Schmoes Know. "The character was created by Dan Abnett and Andy Lanning, first appeared in Nova vol. 4 #7. Within the context of the stories, Cosmo is the security chief of the spacestation Knowhere and a member of the Guardians of the Galaxy."

Director James Gunn recently confirmed Fillion's cameo appearance on Twitter, but didn't reveal what character the actor would take on.

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