# Zero Hour Heard 1973–1974. 136 episodes. The upload contains the entire 130 episode run of the radio how, Zero Hour, which aired in 1973-1974 during the attempted radio revival. Rod Serling hosted this dramatic anthology series, which focused on stories of mystery, adventure and suspense. The first 65 episodes were 13 5-part stories, while the final 65 episodes were each 30-minute individual programs.