Still weak and confused after his fourth regeneration, the Doctor
retreats to Castrovalva to recuperate. But Castrovalva is not the haven
of peace and tranquility the Doctor and his companions are seeking. Far
from being able to rest quietly, the unsuspecting time-travelers are
caught up once again in the evil machinations of the Master. Only an act
of supreme self-sacrifice will enable them to escape the maniacal
lunacy of the renegade Time Lord.
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