Adventure, Drama, Science Fiction | 07 September 1968

Patrick Troughton, Frazer Hines, Wendy Padbury

When two belligerent Dominators and their robotic servant Quarks land on the peaceful planet Dulkis planning to drop a radioactive seed into the planet's core to refuel their spaceship, the Second Doctor, Jamie and Zoe must attempt to inspire the pacifist Dulcians to resist.