Just before Hollywood shuts down for the holidays, Marvel Studios has narrowed its shortlist of actors to star in James Gunn's "Guardians of the Galaxy," with Zachary Levi and Jim Sturgess still in contention to play team leader Peter Quill . Better known as Star-Lord , Quill is the son of a human mother and alien father. A charming troublemaker who serves as an interplanetary policeman, Quill leads a rag-tag group of superheroes ( Drax the Destroyer, a raccoon named Rocket and a sword-wielding woman named Gamora ) in an effort to protect the solar system from an evil alien race. The character isn't as well known as other Marvel superheroes such as Iron Man, Captain America or Thor , but Quill is still a plum role for thesps looking to boost their international profile. Marvel reportedly made test deals with five potential leading men several weeks ago, though "Cloud Atlas" star Sturgess is the only one from that list to remain in contention. Lev