An Edwardian yacht in deep space races around the planets. There is a double agent in the TARDIS crew. The White Guardian warns the Fifth Doctor of great danger. Turlough must finally choose sides and at the end of the race lies the prize of Enlightenment.
as The Doctor
as Tegan Jovanka
as Vislor Turlough
as The White Guardian
as The Black Guardian
as Striker
as Marriner
as Wrack
as Mansell
as First Officer
as Jackson
as Collier
