Will Nathan Fillion’s geek cred generate Castle graphic novel sales?

Actor Nathan Fillion has pretty good comics cred. Marvel Comics will see if that parlays into sales success when a graphic novel inspired by his “Castle” series is released this fall.

The star of Joss Whedon’s “Firefly” series has seen his Captain Mal Reynolds adapted to comics from Dark Horse, as well as his Captain Hammer from Whedon’s “Doctor Horrible’s Sing-Along Blog.” After voicing Steve Trevor in the 2009 “Wonder Woman” animated film, he’s now voicing Hal Jordan, aka Green Lantern, in the animated film “Green

Lantern: Emerald Knights,” due for release June 7.

He’s even a comics reader himself, he told TV Guide.

“I was always reading the comic books; I was always a spectator,” Fillion said. “Now I feel like I own a little piece of Green Lantern.”

On Monday, the “Castle” star, in character as Richard Castle on the season finale of the show, showed off a graphic novel based on his character’s mystery novels.

It’s not just a fictional plot device — Marvel Entertainment and ABC Studios will release that graphic novel this September.

In the series “Castle,” Richard Castle is a best-selling mystery author and creator of the Derrick Storm mystery series.

“It’s exciting to bring the Derrick Storm novels to life for the first time ever,” said Axel Alonso, Marvel Entertainment editor-in-chief, in a news release. “Whether you’re new to the world of ‘Castle’ or a longtime fan, there’s something for everyone in Castle: Richard Castle’s Deadly Storm — and it’s the kind of book that reaffirms Marvel’s commitment to creating new fans of comic books.”

ABC had previously authorized “Richard Castle” novels to be released, but this graphic novel will be the first adaptation in any medium of the Derrick Storm character.

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