The Time War rages around Arcking - a planet serving as a sanctuary for the sick and injured. But Arcking is protected by a mysterious, powerful force: a force the Master will stop at nothing to harness… even if time itself is against him.
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