Ed Brown is a retired gangster with a sense of humour which includes getting his four greatest enemies at one another's throats. Simon helped to put him in jail the last time and intends to repeat the favour, providing Brown allows him to live to do it.
The Doctor is captured by the War Chief, who belongs to the same race of people as the Doctor, and offers an alliance. In the 1917 zone, fighters prepare to attack Central Control.
The Doctor sends Zoe to the war zones to assemble a resistance force. The Doctor remains in Central Control to steal the processing machine, but the War Chief is one step ahead.
The rebels seize control of the aliens' HQ but the Doctor is forced to send a call for help to his own people, the Time Lords.
The Doctor, Jamie and Carstairs have escaped back to the 1917 war zone, but General Smythe is waiting for them and opens fire on them with a machine gun.
