The Invaders premiered on ABC in 1967 and ran for two seasons, created by Larry Cohen and produced by Quinn Martin Productions. It starred Roy Thinnes as architect David Vincent, who becomes convinced extraterrestrials have infiltrated Earth in human form. The memorable main theme, credited to Dominic Frontiere, became closely linked to the show's paranoid tone. Clips of the intro later circulated on television reruns, fan collections and soundboards, where the short orchestral sting found a second life as a ready made cue for alien and mystery content online.