Who would win in a fight brad pitt or starscream?

Brad Pitt is only an actor, not a fighter.   But Starscream is only a comicbook character or at best an action figure.  Brad Pitt could step on Starscream and win.
       Now if we are talking about in a movie, then it would be up to the writer and the director.  Both get to call the shots and Brad Pitt and Starscream just to as directed.