10 Shocking New Doctor Who Era Cliffhangers

10. O... (Spyfall, Part One)

After enduring an entire series with no cliff-hangers (shame on you Series 11), it was exciting to have a two-part opener for Series 12. It’s fair to say that Spyfall, Part 1 was a delightful reintroduction for the Thirteenth Doctor and her companions, as they were forced in a massive conspiracy involving the deaths of spies across the planet.

This led to them picking up the pieces and trying to uncover who was behind this strategic attack. They are guided to ex-operative O, who seems to have some leads for them to follow concerning the suspicious Daniel Barton. It soon became clear that he was in league with a powerful alien entity known as the Kasaavin.

The opener neatly builds up to its shocking climax, and in hindsight things should have been more obvious, but I have to give credit to Chris Chibnall for having these hints out in the open, but tucked away neatly enough that we simply didn’t pay attention. So, naturally, when ‘spymaster’ is dropped by O during the revelation sequence, everything falls into place. In an instant he went from being a kind, heroic side-character, to a unhinged, psychotic mastermind.