The Twin Dilemma

The Doctor is extremely unstable after his regeneration. Peri is unsure what has happened, and when she shows a dislike of his new costume he attacks her. Peri shows him his reflection in a mirror, which has the effect of causing a small breakdown. Repentent of what he had done he chooses to go into exile with Peri. The location for the exile: a lonely moon.

The moon, however, is being used as a hideout for a group of kidnappers who have kidnapped two mathematical genius twins. The twins, with the Doctor, Peri and an investigator, are taken to the planet of Jeconda where the evil Mestor is planning to create an enormous explosion which would release sufficient energy to hatch thousands of Gastrapod eggs. Mestor has ordered the kidnapping of the twins so they can do the calculations necessary.

The Doctor manages to destroy Mestor's body, but his mind transfers to Azmael, a fellow Time Lord. Azmael, though, is on his final incarnation. He starts to regenerate, which this time causes his death, and the death of Mestor.

• Professor Edgeworth (Azmael): Maurice Denham;
• Lt. Hugo Lang: Kevin McNally;
• Mestor: Edwin Richfield;
• Noma: Barry Stanton;
• Drak: Oliver Smith;
• Romulus Sylvest: Gavin Conrad;
• Remus Sylvest: Andrew Conrad;
• Professor Sylvest: Dennis Chinnery (1);
• Commander Fabian: Helen Blatch (1);
• Elena: Dione Inman (1);
• Chamberlain: Seymour Green (3-4);
• Prisoner: Roger Nott (3);
• Jocondan Guard: John Wilson (3);


• UNCREDITED CAST:
• Gastropods: Ridgewell Hawkes, Steve Wickham;
• Jocondans: Mark Bassenger, Graham Cole, Les Conrad, Mike Mungarvan, David Ransley, Robert Smythe;