 The film, also known as Hell Fire and They, was inspired by the British film "The Strange World of Planet X" (1957), and filmed in the style of thrillers directed by Alfred Hitchcock.A group of pilots in the Canadian wilderness begin to hear strange reports over their radios about planes crashing, cars stalling, and a deadly plague which has gripped the planet.As the plot continues, it's clear that Earth is in the midst of an invasion.