This is a good news/bad news post. There have been rumors floating around for a while now that Nathan Fillion would be secretly picking up the role of Nova in the upcoming Guardians of the Galaxy movie for Marvel. It makes sense, after all, he has worked really well with James Gunn on numerous occasions in the past (Slither and PG Porn).

Well, Gunn dispelled the rumors of him playing Nova, but did concede to fans, via Twitter, that Fillion will be popping up. Here’s what he had to say:

@nathanfillion has a very small fun cameo he did as a favor to me.

Marvel’s Guardians of the Galaxy expands the Marvel Cinematic Universe into the cosmos, where brash adventurer Peter Quill finds himself the object of an unrelenting bounty hunt after stealing a mysterious orb coveted by Ronan, a powerful villain with ambitions that threaten the entire universe. To evade the ever-persistent Ronan, Quill is forced into an uneasy truce with a quartet of disparate misfits–Rocket, a gun-toting raccoon, Groot, a tree-like humanoid, the deadly and enigmatic Gamora and the revenge-driven Drax the Destroyer. But when Peter discovers the true power of the orb and the menace it poses to the cosmos, he must do his best to rally his ragtag rivals for a last, desperate stand – with the galaxy’s fate in the balance. Marvel’s Guardians of the Galaxy is presented by Marvel Studios and stars Chris Pratt, Zoe Saldana, Dave Bautista, Bradley Cooper as the voice of Rocket, Vin Diesel as the voice of Groot, Lee Pace, Michael Rooker, Karen Gilian, Djimon Hounsou with John C. Reilly, Glenn Close as Commander Rael and Benicio del Toro as The Collector. Distributed by Walt Disney Studios Motion Pictures, the film opens August 1, 2014.