Seasons & episodes

S16 · E25The Armageddon Factor (5) 1979-02-17 · 25 min＋

The Doctor and Romana finally venture into the Shadow's lair. The Shadow appears to hold all the cards but the Doctor has found an old friend.

S16 · E26The Armageddon Factor (6) 1979-02-24 · 25 min＋

The Doctor and the Shadow have their final confrontation to take control of the Key to Time. Completing it may entail an awful sacrifice. And the Black Guardian will do anything to obtain it and plunge the Universe into chaos.