Series 4 Episode 8 airs at 9pm on Sunday 25th March on BBC Three and sees The Old Ones intent on taking over the world by force. Cutler has other plans, but when they go awry he plots revenge on his own kind.

Meanwhile, Annie is upset as she realises she has been tasked with making the most difficult decision in order to save the world.

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Watch the prequel to the episode…

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