"Castle" season 7 spoilers are here and creator Andrew Marlowe is gearing up for 23 episodes as cast Nathan Fillion gets busy doing a cameo on the "Guardians of Galaxy" as a favor for his friend.

"Guardians of Galaxy" director James Gunn confirmed that "Castle" season 7 cast Nathan Fillion will be seen in the upcoming Marvel movie. However, he dismissed rumors that his friend will play one of the major characters.

In a Twitter post, James Gunn wrote: "The rumors of my pal @NathanFillion playing Nova in #guardiansofthegalaxy have been greatly (and entirely) exaggerated. Sorry, humans."

In answer to a fan with a Twitter handle @STARS_TyranT asking for confirmation to the rumors that "Castle" season 7 cast Nathan Fillion will be seen in the movie, the director replied: "@nathanfillion has a very small fun cameo he did as a favor to me."

Meanwhile, creator Andrew Marlowe dished out "Castle" season 7 spoilers when he posted on Twitter a teaser photo along with the caption: "Wanna see a cool picture of my office light switch? I find it fascinating."

The photo showed that there are 23 episodes for season 7 of Castle.

According to Unreality Primetime website, which revealed potentially "Castle" season 7 spoilers when it noted that episodes 11 and episode 17 are circled in blue pen.

"What the potential significance of these two episodes are remains to be seen, although it's sure got us curious!" the website said. "Could it be that these are the episodes that James Brolin, aka Castle's Dad, is set to appear in?"

Michael Ausiello of TVLine revealed some "Castle" season 7 spoilers when he talked to creator Andrew Marlowe who reportedly said that the first episode will immediately deal with the aftermath of the fiery car crash.

"Viewers will witness the immediate fallout from Rick's fiery car wreck, confirms series creator Andrew Marlowe. Translation: no time jump," he wrote.