Transmitted originally: 30 August 1975 to 20 September 1975.
The Doctor releases the Zygon's prisoners and causes their ship, which has emerged from the Loch, to self-destruct. Only their leader, Broton, survives. He has assumed the identity of the Duke of Forgill and travelled to London. There he plans to give a show of strength by destroying a World Energy Conference with the Skarasen, which is approaching up the Thames. Broton is shot UNIT troops and the Doctor throws the Skarasen its homing device, which it devours. Without a controlling influence, the creature makes its way back to the Loch.
The Zygons made a return appearance in the Eighth Doctor novel 'The Bodysnatchers' by Mark Morris.
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