Just yesterday, we reported that Joseph Gordon-Levitt is a top contender to play Peter Quill, along with the previous finalists Jim Sturgess and Zachary Levi.
Peter Quill is a NASA astronaut who journeys into space after learning that his true father is an alien. He becomes the Star-Lord, the Guardians of the Galaxy's leader, who helps fight injustice across the galaxy.
Michael Rosenbaum most recently appeared on the big screen in the comedy Hit and Run, and voiced The Flash in the animated adventure Justice League: Doom.
Guardians of the Galaxy was released August 1st, 2014 and stars Chris Pratt, Zoe Saldana, Dave Bautista, Vin Diesel, Bradley Cooper, Lee Pace, Michael Rooker, Karen Gillan. The film is directed by James Gunn.