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.
Tommy Steele stars as a talent-spotter at a recording company who determines to organize a concert featuring all the most up-to-date singers and bands, in order that the orphanage where he was brought up be saved from closing.
