The Sontaran Experiment

The Doctor, Harry and Sarah trans-mat down from the Nerva beacon and arrive on Earth in the far future. So much time had passed since the solar flares that Earth has returned to a graceful state with no buildings or animals.

On the planet there is also the crew of a crashed spaceship who were slowly being killed. The killer was a Sontaran who was conducting experiments on humans to see the viability of an invasion.

Sarah was also captured and the experiment was to test her fear threshold. The Doctor challenged the Sontaran to a duel, as is the Sontaran custom.

The Sontaran, not used to Earth's gravity, quickly tired, and returned to his ship to re-energise. Harry had been told by the Doctor how to sabotage the Sontaran energy unit, and instead of re-energising the energy fed off the Sontaran.

• Harry Sullivan: Ian Marter;
• Field Major Styre: Kevin Lindsay;
• Krans: Glyn Jones;
• Erak: Peter Walshe;
• Vural: Donald Douglas;
• Roth: Peter Rutherford;
• Zake: Terry Walsh (1);
• Marshal: Kevin Lindsay (2);
• Prisoner: Brian Ellis (2);


• UNCREDITED CAST:
• Double for the Doctor: Terry Walsh;
• Double for Harry: Terry Walsh (1);
• Double for Styre: Stuart Fell (1);