In “Mickey 17” (in theaters) Robert Pattinson plays a former pastry chef and an amiable dimwit who applies for a lousy, inevitably lethal job on a contaminated ice planet. As an Expendable, Mickey goes into the worst sorts of situations, dies in some horrible way — you know, for the mission — then gets cloned over and over again to take on the next awful task. At various points he’s irradiated, instructed to breathe in a deadly space virus, left for dead in a cave full of space bugs, used as a guinea pig in a series of failed experiments, and fed bad meat. In many Hollywood movies about clones, the doppelgängers are just as expendable as Mickey, created to...