There's good news for Nathan Fillion fans: He will make a cameo in "Guardians of the Galaxy." But there's also bad news for Nova fans: The rumors he's playing the Human Rocket "have been greatly (and entirely) exaggerated," according to director James Gunn.

Gunn took to Twitter to squash a rumor that appeared on the internet Saturday:

The rumors of my pal @NathanFillion playing Nova in #guardiansofthegalaxy have been greatly (and entirely) exaggerated. Sorry, humans.- James Gunn (@JamesGunn) June 21, 2014

However, in a response to a followup question, Gunn did confirm that the "Firefly" and "Castle" actor will appear in the film:

"@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

Fillion has previously appeared in two other Gunn films, "Super" and "Slither."