10 Doctor Who Easter Eggs Only Hardcore Fans Spotted

10. The Ood And The Scarecrow (Hell Bent)

1976’s The Deadly Assassin established the idea of the Matrix (no, not that one): a great big database where all Time Lord knowledge is stored.

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39 years later, Hell Bent took us into the Matrix’s firewall: the crypt-like Cloisters.

This buffer zone serves as a booby trap for anyone "stupid enough to break in” (as the Twelfth Doctor puts it). It doesn’t just neutralise potential infiltrators, however – it imprisons them, making them part of its defence.

This allows for some good old-fashioned monster cameos, with the most prominent victims being a bronze Dalek, a Cyberman (of the style first seen in Nightmare in Silver), and some Weeping Angels.

But they’re not the only foes to have tried (and failed) to access the Matrix.

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Look closer, and you’ll see a Mire helmet lurking behind Clara; a Weeping Angel Cherub on the floor; and, most tantalisingly of all, the dismembered heads of an Ood and a Scarecrow.

Both are only seen fleetingly in the episode, but director Rachel Talalay offered a a better look at the Ood over on Twitter, which shows it to be in a particularly sorry state.

It’s a really dark touch – and surprisingly gruesome for Saturday teatime!

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