Okay, so Nathan Fillion and Guardians of the Galaxy director James Gunn have quite a history, working together on the movies Slither and Super. They're also good friends off-camera, which led many to speculate Fillion would have a role in the Marvel movie. And here's what Fillion said some months ago on that very subject....
Fillion: "[Want] to get a part? Or maybe did. I'm just saying maybe. Maybe it'll be a surprise. Maybe check the credits of the movie when you watch it."
Turns out the answer is "yes', yes Fillion has a cameo in Guardians of the Galaxy, confirmed by Gunn himself...
“@STARS_TyranT: Are the rumours true that he has some part in the film?” @nathanfillion has a very small fun cameo he did as a favor to me.
— James Gunn (@JamesGunn) June 21, 2014
And of course people have been saying Fillion would play Rich Rider aka Nova, a member of the Nova Corps which we know have quite a role to play in the movie. Turns out that is not what's happening...
The rumors of my pal @NathanFillion playing Nova in #guardiansofthegalaxy have been greatly (and entirely) exaggerated. Sorry, humans.
— James Gunn (@JamesGunn) June 21, 2014
Fillion may not even be a recognizable Marvel character. Perhaps he shows up as a "spin" on his Mal Reynolds character from Firefly? So keep an eye out for Fillion when Guardians of the Galaxy opens on August 1st. 
