Sam Rockwell Joins 'Cowboys And Aliens' Cast

Sam RockwellSam Rockwell will reteam with his "Iron Man 2" director, Jon Favreau later this summer on "Cowboys & Aliens."

According to The Hollywood Reporter, Rockwell has signed on to portray a bar owner named Doc who joins the fight against the aliens in the old west. The role was reportedly rewritten and expanded for Rockwell by "Cowboys & Aliens" screenwriters, Alex Kurtzman, Roberto Orci and Damon Lindelof.

Rockwell's "Iron Man 2" co-star Robert Downey Jr. had previously been attached to play the lead character, Zeke Johnson — a gunslinger who helps unite a tribe of Apache warriors and his fellow settlers against the alien invasion — before the role ultimately went to Daniel Craig ("Casino Royale").

Olivia Wilde, Harrison Ford and Noah Ringer round out the major cast members announced to date.

"Cowboys & Aliens" was created by Platinum Studios' Scott Mitchell Rosenberg before it was published as a graphic novel in 2007 by writers Fred Van Lente & Andrew Foley and artists Dennis Calero & Luciano Lima.

Back in January, word broke that "Cowboys & Aliens" is under consideration to be filmed in 3-D when it begins shooting in July.

"Cowboys & Aliens" is set to invade theaters in July 2011.

What are your thoughts on Sam Rockwell's addition to the cast of "Cowboys & Aliens"? Does the cast of Craig, Ford and Wilde make you more likely to see this film next summer? Who else would you like to see join the cast? Saddle up and let us know what you're thinking in the comment section or on Twitter!