There's also a Stargate SG-1 episode about this, S04E02 "The Other Side." The team goes through the gate and finds themselves in a bunker far underground with a civilization fighting a war by remote drone. They start out willing to trade with the bunker people, but the bunker people quickly show their ass by being racist to Teal'c. The team investigates further and finds out that the bunker people are space Nazis who started the war they're losing. The team sabotages the space Nazis' drones, then leaves back through the gate while making sure space Hitler dies horribly.
Also space Hitler is played by René Auberjonois.
Just mended my cat's favorite toy, sewed an ear back on that he'd almost completely ripped off. It doesn't look quite the same but it's pretty close and should be stronger than the original stitch.