The Doctor has vanished from the Inferno project… or has he? He finds himself in the same place, but everyone has changed… and the drilling is closer to its deadly conclusion.
May 16, 1970
May 30, 1970
Christopher Benjamin, David Simeon, Derek Newark, Derek Ware, Ian Fairbairn, John Levene, Nicholas Courtney, Olaf Pooley, Sheila Dunn