The Earth colony Terra Alpha, the future. With the aid of her sweet-natured executioner, Helen A, ruler of the planet, has ensured the population is happy - on pain of death! The Doctor and Ace decide to fight for the right to be miserable.
Quest roles:
Lesley Dunlop(Norna), John Normington(Morgus), Sheila Hancock(Helen A.), Georgina Hale(Daisy K.), Ronald Fraser(Joseph C.), Mary Healey(Killjoy), Harold Innocent(Gilbert M.), Cy Town(Dalek Operator), Rachel Bell(Priscilla P.), Tim Barker(Harold V)