Smile (TV story)

 was the second episode of the tenth series of Doctor Who produced by BBC Wales.

Synopsis
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Plot
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Cast

 * The Doctor - Peter Capaldi
 * Bill - Pearl Mackie
 * Nardole - Matt Lucas
 * Kezzia - Kiran L Dadlani
 * Goodthing - Mina Anwar
 * Steadfast - Ralf Little
 * Nate - Kalungi Ssebandeke
 * Emojibot - Kiran Shah
 * Emojibot - Craig Garner

Uncredited

 * Praiseworthy - Kaizer Akhtar

Crew
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Language

 * The Emojibots speak Emoji. Emoji used by them include:
 * 😃 – smiling face
 * 💀 – a skull, a symbol of death
 * 😢 – crying face
 * 💡 – a light bulb, symbolising a new idea forming
 * 😕 – puzzled face
 * ❓ – question mark, indicating confusion
 * 👍 – thumbs up, indicating approval

Technology

 * The Emojibots are an interface of the Vardi.
 * All inhabitants and visitors are given mood badges.

Locations

 * The planet the Doctor and Bill visit is called Gliese 581 D.
 * The spaceship the Doctor and Bill find on the planet is called the Erehwon.

Food and beverages

 * The Doctor and Bill are served squares of algae jelly.
 * According to Bill, it smells like fish.

Species

 * The Vardi can eat other species, leaving behind bones and skulls.
 * The Vardi can cloak themselves as buildings by staying really close together.

TARDIS

 * Bill asks why the chairs in the TARDIS are so far from the console.
 * Bill asks whether she has to wear a seatbelt during flight.
 * Bill also asks if there is a steering wheel.

Story notes

 * The Doctor says that Scotland demands independence every planet they go to. In real world current events, at the time of this episode's release, Scotland was again from the United Kingdom, as a result of Brexit.

Ratings
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Filming locations

 * The City of Arts and Sciences (Ciudad de las Artes y las Ciencias), in Valencia, Spain, is the real setting for the Gliese 581 D scenes.

Production errors
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Continuity

 * Nardole reminds the Doctor that he can't go off-world because he promised. (TV: The Pilot)
 * The Doctor states that the TARDIS takes him where they need to go, rather than where they want to. (TV: The Doctor's Wife)
 * There's a bust of Queen Nefertiti in the spaceship. (TV: Dinosaurs on a Spaceship)
 * The Doctor mentions having previously encountered human colony ships. (TV: The Ark, The Ark in Space, The Beast Below)
 * The record of human history Bill finds includes Vincent van Gogh's self-portrait. (TV: Vincent and the Doctor)
 * The Doctor had once before visited a human colony in which unhappy people were killed. (TV: The Happiness Patrol)
 * The Doctor mentions Scotland wanting independence everywhere they go, such as when they wanted a separate ship from Starship UK. (TV: The Beast Below)
 * Bill says that she is in a "proper spaceship". The Tenth Doctor was previously offended when Donna Noble said something similar. (TV: Planet of the Ood)
 * Bill once again describes the Doctor's way of running as "a penguin with its arse on fire". (TV: The Pilot)

DVD releases
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Blu-ray releases
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Digital releases
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