There are no half-measures when it comes to moon Nazis. The very phrase “moon Nazi” invites laughter. There’s no room for serious consideration, and even biting satire can be a stretch. It’s a goofy premise ripe for B-movie fun, and Iron Sky has no problem playing the fool and being silly right up until it begins to believe that people came to a movie about moon Nazis for CGI space battles and anything resembling dramatic contemplation. Director Timo Vuorensola forgets that when you make a movie involving moon Nazis, you must always stay true to the moon Nazis and the ridiculousness they embody.