Regular Cast

Tom Baker (The Doctor), Lalla Ward (Romana), Jane Slavin (Xankari / Teacher),  Sheila Ruskin (Flague), Brian Vernel (Robert), John Banks (Franklin), Josh Bolt (Philip), Alistair Petrie (John)


In the control room of a World War 2 submarine something strange has started to happen. As the ship runs out of control, its crew begin to fall unconscious…

Finding the submarine in the last place they’d have expected, The Doctor and Romana are confronted by a mystery. Once fully populated, there are now only three men on board. And there’s now also a chimpanzee.

What has happened to the rest of the crew? What are the strange noises they can hearoutside the hull?

And most importantly, who, or what, is Dethras?

Written by: Adrian Poynton
Directed by: Nicholas Briggs



  • The Doctor has been bypassing the randomiser for a few journeys. (The Beast of Kravenos, The Eternal Battle, The Silent Scream)
  • Romana states the Black Guardian is bound to find them again. (The Well-Mannered War, Casualties of Time)
  • The Doctor uses his etheric beam locator. (Genesis of the Daleks)
  • Time Lords can survive for a short time in the vacuum of space. (Four to Doomsday)
  • The Sixth Doctor will later encounter Voord that quick-evolve themselves into Cybermen. (The World Shapers)
  • The Doctor still wishes to go to Brighton to visit the sea-side. (The Leisure Hive)
  • K9 has been analysing the time eddies in the power room.
  • The Stargazer’s Halo is the site of many derilect spaceships, a vast junkyard in a ring around a dead planet in deep space, with a low level gravity field maintaining the orbit.
  • A Lodestar 27 with its original ion drive and a Xankari cargo ship are amoung the derelicts.
  • Submarines are built to withstand pressure and atmosphere.
  • Galactically speaking, the Xankari, pronounced “Zan-kar-I, ” were active in the first half of the 20th century, and were involved in a war.
  • Romana states that sound doesn’t travel in a vacuum.
  • The Doctor uses sonar to send a message to a Xankari ship that can teleport them to safety.
  • Flague believes strongly in preemptive strikes.
  • Dethras is known as the “Einstein of Evolution” for his research into hyper-evolution. The Doctor’s read all his books.
  • Philip remembers being given a lesson in”notable extinct races, ” which included information on TARDISes.

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