For those of you who saw Spy Kids 2 (You know the one: It wasn't as good at 1 but was leaps and bounds above 3), you might have gotten your biggest kick out of all the creatures that lived on the Island of Lost Dreams. When director Robert Rodriguez created them, he was doing a sincere homage to the works of stop-motion innovator Ray Harryhausen. Ray's legacy has earned him fans across the generations who continue to honor him in current films (thus the name of the restaurant "Harryhausen's" in Monster's Inc.). They speak to the inner kid in all of us.
Even in the minor B-films of the 50's, his work stands out as of that done by a grand master at his art. Earth vs. The Flying Saucers and 20 Million Miles to Earth share a lot of traits in addition to both being worked on by Harryhausen. Both were produced by Charles H. Schneer. Both have Thomas Henry Browne and John Zaremba in supporting roles (playing the military brass and the scientist, respectively). Both even have actress Joan Taylor in the female lead role. Both also have ponderous opening narration and extras reacting badly to the fantastic effects they can't see. There are some differences to point out, though.
You may have noticed that I haven't mentioned the plots yet, and that's on purpose. Being cheesy 50's sci-fi films, the plot is besides the point, sometimes blatantly so. For the record, Earth vs. The Flying Saucers is pretty much exactly that. There are neato story developments concerning battery operated tape recorders and universal translators, but otherwise it concerns blowing stuff up really good. The aliens themselves are kind of goofy looking in their incredibly rigid spacesuits, but the saucers are more impressive as their simple design and the clean B&W photography shows them off to great effect. We also get to see them destroy historic buildings via sonic rays and, later, by falling out of the sky and plowing into them. Harryhausen has actually said this was his least favorite film. I can see why, but that doesn't mean it's not an enjoyable way to pass an afternoon.