After reading some of the other comments, there's only one thing everyone should keep in mind. This film is for laughs and is spoofing the early 50's sci-fi films that some of us grew up watching. In the early film, War of the Worlds, the Martians were killed by micro organisms that were in our atmosphere. Here they were killed by Slim Whitman music. How about when the Martians were chasing people and zapping them while the "translator" machine keep saying "Don't run,we are your friends". The Martians like Tom Jones so much that they joined his back up singers. Every time I watch this film I see something else that's there for a "joke". Don't try to make this movie fit the sci-fi mold; just watch it for the spoofs and enjoy yourself.