Back when Guardians of the Galaxy was initially casting, there were lots of rumors that Castle's Nathan Fillion might be in the running for the role of Star-Lord. After all, Fillion had worked with Guardians of the Galaxy director James Gunn previously on the film Super, and the two are known to be good friends.

Of course, Chris Pratt ultimately landed the role of Star-Lord, so the Nathan Fillion rumors faded away. However, just because Fillion wasn’t cast as Star-Lord, doesn’t mean that he might not have landed some other role.

At the Wizard World St. Louis Comic Con this past weekend, a fan asked Nathan Fillion if he had been wanting to get a part in Guardians of the Galaxy.

“Wanting to get a part? Or maybe did,” responded Fillion.

Then, Fillion added, “I’m just saying maybe….maybe there’ll be a surprise…maybe check the credits of the movie when you watch it.”

Of course, it's unlikely that Fillion has a major role, as he likely would have been spotted on the set. However, it certainly sounds like there’s a strong possibility that Fillion might have filmed a small role for Guardians of the Galaxy.