The Doctor is extremely unstable after his regeneration. Peri is unsure what has happened, and when she shows unliking 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.

Locations

Springwell Quarry, Springwell Lane, Rickmansworth, Herts

Gerrards Cross Sand and Gravel Pits, Wapseys Woof, Oxford Road, Gerrards Cross, Herts

The eighth title sequence, another version of the star field, is first used for this story. It is credited to Sid Sutton and Terry Handley, but all subsequent episodes credit Sutton only.

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