[S10E2] Smile
They come across a robot, which Bill is impressed by. However, the Doctor tells her it's not a robot, but instead a interface device to interpret for the Vardy. Bill wonders if it speaks; the Doctor says it depends on what factor of human language has survived into this era. The robot's face smiles, with two smiling faces for eyes. Bill laughs that it only speaks emoji; the Doctor is less than impressed. The Emojibot gives them badges that reflect their moods in the form of emojis, which only other people can see.
[S10E2] Smile
In the centre of a corridor, the Doctor and Bill find themselves surrounded by Emojibots that can sense their fear. The city is full of them, so the robots will catch you eventually; thus making a chase pointless, as they can maneuvre targets into a trap. The Doctor wonders why they're being attacked NOW, when they've been there a long time. Realising something, the Doctor tells Bill to smile using her whole face; she wonders why as the Doctor checks her badge. Seeing Bill's badge change to a smile, the Doctor tells her that smiling has a psychological effect on one's mood. He further explains the robots' programming has caused them to make these mistakes; the Vardy were programmed to make people happy by ensuring their environment was comfortable, but the programming has evolved and gotten jumbled up somehow. The Vardy now seem to think that they need to kill people when they become unhappy.
The Doctor tells Bill they should give the Emojibots what they want, and smile. The Doctor starts walking down the exit hall, telling Bill to not even bother following him unless she is smiling. They slowly walk down the hall. The Doctor tells the robots that they've enjoyed their stay. Bill tells him that next time, they should go to Aberdeen or Wiltshire. Agreeing with her, the Doctor and Bill move past the Emojibots, now bearing annoyed faces, but still poised to attack.
They run outside, where an Emojibot grabs Bill's arm. Bill screams in terror, as the Doctor tells her to smile. However, Bill is too scared to fake happiness. Instead, the Doctor sonics the robot's arm, breaking it and freeing Bill. This signals a swarm of Vardies to seemingly emerge from the building's structure itself. They continue running, with the Doctor sure the Vardy will not be concerned with them once they are out of the city.
Bill tells the Doctor her deduction; he doesn't call a helpline because he's it. He gives advice and assistance. The Doctor tells her that is just a coincidence; he just happened by this house of horrors, and decided to muck in. He tells Bill to look at the wall, going on to explain that the Vardy are what makes up the city. Bill genuinely smiles at the absurdity. However, the Doctor believes that the centre of the city houses the spaceship in which the colonists first arrived, comparing it to the Vikings, who lived in their ships until they built new homes.
They follow a staircase downwards, finding a damaged ships's hull; the Doctor is glad to have found a real wall. Finding the entrance to ship, Bill tries to pull the door open to no avail. Humorously, the Doctor presses a button that opens the door inward. "Not even locked; they were expecting to live in peace" the Doctor sadly notes. He then suggests locking it behind them, which alerts all Emojibots in the city, whose smiley emojis now incorporate exclamation marks for eyes. 041b061a72