Gas-s-s-s

Gas-S-S-S
Directed by	Roger Corman
Produced by	Roger Corman
Written by	George Armitage
Starring	Robert Corff Elaine Giftos George Armitage Alex Wilson
Music by	Country Joe & the Fish Barry Melton
Cinematography	Ron Dexter
Edited by	George Van Noy
Production company	San Jacinto Productions
Distributed by	American International Pictures
Release date	1970 (1970)
Running time	79 min.
Country	United States
Language	English

Gas-s-s-s (also known as Gas! or It Became Necessary to Destroy the World in Order to Save It) is a 1970 motion picture produced and released by American International Pictures. It was producer Roger Corman's final film for AIP, after a long association. He was unhappy because AIP made several cuts to the film without his approval, including removing the final shot where God commented on the action - a shot which Corman regarded as one of the greatest he had made in his life.

The movie is a post-apocalyptic dark comedy, about survivors of an accidental military gas leak, of an experimental agent that kills everyone on Earth over the age of twenty-five. (A cartoon title sequence shows a John Wayne-esque Army General announcing — and denouncing — the "accident"; the story picks up after the victims have died.)

The lead characters, Coel and Cilla, were played by Robert Corff and Elaine Giftos, and the cast features Ben Vereen, Cindy Williams, Bud Cort and Talia Shire (credited as "Tally Coppola") in early roles. Country Joe McDonald makes an appearance, as spokesman "AM Radio".

In Dallas, at the Southern Methodist University, news comes in about a gas which has escaped from a military facility. It starts killing everyone over 25.

Hippie Coel meets and falls in love with Cilla. They discover a Gestapo-like police force will be running Dallas and flee into the country.