4/5 As Jamie and Cully fight the Quarks the Dominators threaten the other Dulcians.
3/5 A Dominator spacecraft lands on the peaceful world of Dulkis.
2/5 The Doctor and Jamie are taken captive by the Dominators and subjected to tests.
1/5 The TARDIS lands on the planet of Dulkis, where other less peaceful aliens have arrived.
7/7 The human factor spreads through the Dalek city and Dalek fights Dalek in a civil war. (R)