Them! (1954, USA)
Hey, the giant mutant ants in this movie are almost actually genuinely creepy! And when, after descending into the underground lair of the ant queen, Joan Weldon orders her soldier friends to burn all the larva to death, you suddenly realize where the entire movie Aliens was stolen from. Watched it all. This is pretty much the perfect 50s monster movie, (incidentally featuring, drumroll, the recently invented Wilhelm Scream.)
Men of the Fighting Lady (1954, USA)
Contemporary American movies about the Korean war were all pretty awful, and I wonder why. Some of the best movies ever made about the Second World War were made during or right after the war itself, (contrary to the myth of mindless jingoism). But Korea, you barely notice it, and by now it’s all over, and there aren’t even any good stories to remember it by. Watched: 5 minutes.
Gog (1954, USA)
Here’s another movie that sets a template for later sci-fi, with the old “scientists stuck in high-tech underground facility where Everything Goes Wrong” trope. It must have been used hundreds of times – and that’s just counting Dr Who. Nice to meet you, welcome on board! Watched: 42 minutes. Oh, and Gog and Magog work well as early Daleks.