The first in a two-part finale of Doctor Who sees some classic baddies return...
The Doctor, Bill, Nardole and Missy are now a quarrelsome foursome, but they'll want to bond a little better when they arrive on a 400-mile-long spaceship about to be sucked into a black hole.
Horrors waiting on board include the Master (John Simm, back after six years), who'll be meeting up with Missy, even though they're different incarnations of the same Time Lord!
But the most terrifying passengers of all are Mondasian Cybermen – the original form of one of the Doctor's deadliest, most famous foes.
They first turned up in 1966, and have long been a favourite Doctor Who alien of Peter Capaldi's.
He'll be happy these cloth-faced semi-mechanical beings are back, but his Doctor has one hell of a battle on his hands…
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