A futuristic utopian colony world run by robots who speak emoji became a living hell for The Doctor and Bill in episode two of Doctor Who series 10 and viewers couldn't help but think of another sci-fi series while watching the adventure unfold.

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As the Vardy robots turned on the humans who'd entrusted them with the task of establishing a glorious new colony, some wondered if Smile was, in fact, a lost episode of Charlie Brooker's Black Mirror.

It's not a thought beyond the realms of possibility, though. Brooker did tell us he'd love to write a really horrible Doctor Who Christmas special.

Smile wasn't his creation, though. It was the work of Frank Cottrell-Boyce, who previously penned series 8 episode In The Forest of The Night.

Cottrell-Boyce's inspiration for the tale extended back to a time long before Black Mirror. If you look closely you'll notice the colony ship in the episode is called Erehwon. That's 'nowhere' spelled backwards, and a direct reference to Samuel Butler's 1872 novel about a dystopian society where people live in fear of machines rising up to overtake them.

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The Vardy (those killer micro robots who are almost reminiscent of the nanogenes in The Empty Child/The Doctor Dances) were named for a friend and Doctor Who robotics advisor.

Speaking of robots, the jury is still out on those emojibots, but fans did seem to agree on one thing: The Doctor's personal emoji badge had fantastic eyebrows.

Oh, and one a side note, remember that Fleischmann cold fusion engine on the ship? It was named for scientist Martin Fleischmann, who together with Stanley Pons attempted to make cold fusion a reality in the 1980s.

Yeah, science!

No wonder the Doctor was so eager to march for the noble pursuit in London.

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Doctor Who continues on BBC1 on Saturday at 7.20pm

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