Barry Stanton

Jim Hacker considers cancelling the Trident program after discovering some interesting facts about the UK's defence system.

Identical twins are kidnapped by Azmayl, an elderly man who is a Time Lord from the Doctor's past.

Georgina's (Lesley-Anne Down) renewed associations with an irresponsible group of young socialites results in tragedy.

Mestor's cruel domination over the population of Jaconda takes a toll; the Doctor appears to have been blown up.

Doctor's old Gallifreyan friend Azmael comes to a realisation that he has been corrupted; Mestor's true plan is revealed.

Mestor claims that all he wants is for the Sylvest twins to help him repopulate his home planet, but the Doctor is aware that not everything is as it seems.