Transmitted originally: 19 April 1975 to 10 May 1975.
The Cybermen invade the beacon and force the Doctor and the two remaining crew to each carry a cobolt bomb to the centre of Voga. Kellman, however, is a double agent working for the Vogans, the natives of the asteroid who have resorted to a hidden lifestyle to escape the attention of the remaining Cybermen. The Vogans planned to bring the remains of the Cyber-race to Voga so they can be destroyed once and for all by a rocket, known as Skystriker. The Doctor manages to get rid of the bomb and returns to the beacon, which the Cybermen evacuate when they learn of the rocket. The Doctor manages to redirect the missile towards the Cybermen's craft, which is destroyed. The TARDIS arrives and the Doctor finds an emergency message has been sent by the Brigadier...
Kevin Stoney, who played Vogan leader Tyrum in this story had played both an ally to the Daleks, Mavic Chen from 'The Dalek's
Master Plan' and the Cybermen in 'The Invasion', in which he played the villainous Tobias Vaughn.
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