 Inspired by "The Goon Show", "the four or five crazy guys" of the Firesign Theatre built a large following with their satirical plays on recordings exploring the dramatic possibilities inherent in stereo.A brief resurgence of production beginning in the early 1970s yielded Rod Serling's "The Zero Hour" for Mutual, National Public Radio's "Earplay", and veteran Himan Brown's "CBS Radio Mystery Theater" and "General Mills Radio Adventure Theater".These productions were later followed by the "Sears/Mutual Radio Theater", "The National Radio Theater of Chicago", "NPR Playhouse", and a newly produced episode of the former 1950s series "X Minus One".