His popularity waned by the early 1950s. He spent the next decade appearing on various television episodes, but eventually achieved a form of cult status as the irradiated 60-foot hero of Bert I. Gordon's sci-fi outing, The Amazing Colossal Man (1957). After winding down his screen career in the 1960s, Langan re-invented himself as a successful real estate salesman. He was married for forty years to Actress Adele Jergens, with whom he had a son, Tracy.