Nathan Fillion's Role in Guardians of the Galaxy Movie Revealed?

Rumors surfaced late last week that Nathan Fillion would appear in Marvel's Guardians of the Galaxy movie, which hits theaters on Aug. 1. Many fans speculated he would appear in the post-credits scene of the film as Richard Rider, aka Nova Prime. But now, a new report claims to know Fillion's character's true identity.

The folks at The Schmoes Know posted a new report to claim Fillion would appear as Cosmo in the film:

"According our very reliable source with intimate knowledge of this and the production has spoken exclusively to us about this and we here at Schmoes Know have our answer: Nathan Fillion will be voicing the part of Cosmo, the psychic Russian cosmonaut dog that has appeared in the Guardians of the Galaxy comics."

This casting seems to fit with the comedic and wacky tone of the movie. All that remains now is to see how it unfolds on screen.

Director James Gunn had previously cleared up the rumors and confirmed Fillion's presence in the movie. A Twitter user asked Gunn if the rumors were true about the Castle star's appearance in the movie, and the director replied he "has a very small fun cameo he did as a favor to me." Gunn also debunked the rumor that Fillion would play Nova, so now the guessing game begins as to which character he does play.

"The rumors of my pal @NathanFillion playing Nova in #guardiansofthegalaxy have been greatly (and entirely) exaggerated. Sorry, humans," Gunn tweeted.

What do you think of Fillion as a psychic, Russian dog in Guardians of the Galaxy? Let us know in the comments below.