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.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Derek Newark(Greg Sutton), John Levene(Sergeant Benton), Sheila Dunn(Petra Williams), Ian Fairbairn(Doctor Chester), Derek Ware(Pigbin Josh), Olaf Pooley(Professor Stahlman), Christopher Benjamin(Jago), David Simeon(Alastair Fergus)