Teenagers from Outer Space (a.k.a. The Gargon Terror (UK title), The Boy from Outer Space, and originally titled The Ray Gun Terror) is a 1959 American independent black-and-white science fiction cult film released by Warner Bros. The film was produced, written and directed by Tom Graeff and stars David Love, Dawn Bender, Bryan Grant, Harvey B. Dunn, Tom Graeff and King Moody. Teenagers from Outer Space was distributed theatrically by Warner Bros. on a double feature with Gigantis the Fire Monster. In the film, a young alien named Derek becomes a fugitive on Earth after he defies his crew's directive to eradicate human life in order to use Earth as grazing grounds for giant voracious livestock they call Gargons.

Plot

A flying saucer arrives on Earth, searching for planets suitable to raise Gargons, lobster-like but air-breathing monsters that are a reserve food supply on their home planet. Crewman Thor vaporizes a dog named Sparky with a raygun. Another crew member, Derek, discovers an inscription on Sparky's dog tag and concludes Earth is inhabited by intelligent beings, and therefore they must search elsewhere for Gargon raising grounds, since once full-grown Gargons are a grave menace. The other aliens see no need to spare Earth; they regard themselves as the supreme race, and pride themselves that families and friendships are forbidden on their world. Derek draws a raygun on them and reveals an ancient book distributed by an underground rebellion, which commemorates the more humane periods of their world's history.