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Produced by Britain's Trigor Pictures, Thin Air stars Patrick Allen as Bob Megan, an investigator called in to solve a bizarre mystery: During training courses, British parachutists are disappearing in a strange red mist, leaving no trace. Even more mysterious is the fact that they later turn up, with their bodies filled with lethal doses of radiation. Megan, aided by Jim Radford (Neil Connery, brother of Sean Connery), begins an investigation, which uncovers an unearthly beauty Lorna Wilde who somehow is incapable of being photographed. Eventually, Megan and Radford discover that the parachutists are being kidnapped by aliens from the planet Mygon, who use the men to try to impregnate Mygonian women, thereby saving their dying civilization. Unfortunately, a side effect of this plan seems to be the irradiation of the earthlings. Megan exposes and foils the alien plan, but he also decides to lead an effort to discover a way of saving their race from extinction.