Red Dawn - Chris HemsworthLooks like the team trying to drag Vince Flynnâs Mitch Rapp character to the screen are going to go back to the casting drawing board. For while Chris Hemsworth had been in talks to make the journey from Asgard to the role of the young Rapp, Deadline reports that heâs turned down the offer.American Assassin, which is sourced from Flynnâs Rapp novels, would chronicle the early years of the central hero, when he was a college athletics scholar. When a terrorist attack kills someone close to him, he signs on to hunt bad guys for the CIA.The film has Jeffrey Nachmanoff set to direct from a script currently credited to Mike Finch. And Bruce Willis apparently remains in negotiations to play Rappâs mentor at the agency.Hemsworth had been considering the idea of starring, but his increasingly busy schedule proved to be the roadblock. Heâs currently close to finishing work on Thor: The Dark World, then heâll move onto Steven Spielbergâs Robopocalypse. After that, he has a little movie called The Avengers 2 likely to eat up a chunk of his free time.So while we can't write our threatened "Rapp Star" headline just yet, it's coming people... It is inevitable.