Sam Rockwell is back on movie screens in Matthew Vaughn‘s latest spy romp, “Argylle,” but what’s next for the actor? A return to a certain MCU role, maybe? Jimmy Fallon addressed rumors that Rockwell will reprise his “Iron Man 2” character Justin Hammer during the actor’s interview on “The Tonight Show” last night. And while Rockwell couldn’t confirm anything, he said he’s “in” if Marvel Studios wants him back.