uses the travel pod taken by the Doctor to travel to the capital with a Quark. The robot kills Tensa on command. Rago says that the fittest Dulcians will be enslaved to use on the Dominator homeworld. The rest will be left on Dulkis to die, as the planet is doomed. Toba returns to the ship and demands to know who destroyed the Quark. Balan is killed for refusing to answer, and the Doctor is selected to die next. Rago returns and sends Toba to complete the drilling and prepare the bore rockets, using the Quarks and the Doctor, Zoe, Teel and Kando as slaves. Rago focuses on a nuclear seed device to be dropped down the central borehole. He also hears from the Fleet Leader that no Dulcian slave force is to be assembled: all the Dulcians are now to stay on the planet to die when it is destroyed. The dig proceeds with the Doctor and the other slaves making progress, but when Toba abandons his watch post Jamie and Cully disable another Quark and free their friends. The Doctor has worked out the Dominator scheme: a nuclear fission seed will be dropped down the borehole, converting the entire planet into a radioactive mass to power the Dominator fleet. They begin digging a tunnel to the central borehole to steal the deadly device before it can detonate. Jamie and Cully help by destroying Quarks with homemade bombs. The Doctor intercepts the seed during its descent but tells his friends that it cannot be defused. Cully, Teel and Kando are told to flee in the remaining travel pod, while Jamie and Zoe are sent to the TARDIS. The Doctor runs to the Dominator ship and smuggles the seed on board before the craft lifts off. It departs and the Dominators’ last vision is of the seed device rolling on the floor toward them. The Doctor watches the Dominator ship being destroyed and then heads back to the TARDIS which departs in a hurry to avoid the advancing lava flows from the new volcanoes. Production Episode 3 had no on-screen episode number caption. The Quarks were created as an attempt to create a monster with the same merchandising potential as the popular Daleks. The pacifist Dulcians were originally conceived as a satire on the 1960s hippie subculture. This serial was originally composed of six episodes, but it was deemed too