Thrill-crazed space kids blasting the flesh off humans!
That's what's the tagline promises in the 1959 science fiction movie "Teenagers From Outer Space", a film obviously inspired by the outrageously hopped-up fear of teenage rebellion and juvenile delinquents of the time. The plot (such as it is) revolves around a force of Martians disguised as human teenagers paving the way for an invasion with the help of their lobster-like pet monsters, the Gargons. One of the space-kids (going by the unlikely name of Derek) falls for a human girl, in true Romeo and Juliet fashion, then saves the world and dies tragically.
Needless to say, the special effects are abysmal (unable to afford even a cheap mock-up of the monster, they used a lobster's shadow instead), the plot is weak, and "Teenagers From Outer Space" nowadays just screams B-movie. To add insult to injury (to the reputations of all involved with this film), TFOS was once mocked on the infamous Mystery Science Theater 3000.
In case you haven't figured it out yet, the movie and the role-playing game in deek's writeup have nothing to do with each other.