The beach at Tadcaster in southern England is suddenly engulfed in an unnaturally dense fog. Soon after, the Doctor receives a postcard from the Master indicating he is responsible. The Doctor and Tadcaster native Joe journey into the fog. They discover the Master is using Sarkanmist-flowers to generate the fog. If they bloom, their seeds will spread and the Earth will be covered in the dense fog.
Attempting to catch up with the Master, Joe and the Doctor commandeer the pier train. They jump off the train as it reaches the end of the tracks and crashes into the Master and the mist-flowers, sending all of them into the ocean, where the flowers are destroyed and the Master disappears.
According to one account, the Master had the appearance of Roger Delgado while on Gallifrey. According to another, he had Anthony Ainley's likeness. According to another one, the one with James Dreyfus's appearance was the incarnation who ran away from Gallifrey.
While fighting to extend his life at the end of his regeneration cycle, many bodies were possessed by the Beevers incarnation, but all kept somehow reverting to his real being until he finally regenerated into the MacQueen one. Hence, these sections cannot be strictly chronological
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