Doc Savage made it to the radio three times: 1934-35, 1943 and 1985. The 1934-35 episodes were 15 minutes each and were written by Lester Dent. Episodes 27-52 were repeats of the 1934 episodes. The 1943 episodes were 30 minutes long. Episodes 76-78 were repeats of selected 1943 episodes. All the scripts were credited to Lester Dent; no recordings of any episode, nor records of cast or crew exist. The 1985 National Public Radio episodes were 30 minutes each. They were two series, Fear Cay (Episodes 79-85) and The Thousand-Headed Man (Episodes 86-91).