A smile can be deceptive… and that’s certainly true on the planet where The Doctor and Bill take the TARDIS this week.
The pair have parked up near a sparkling space-age city, a development of the future that humans will be able to colonise in peace and harmony after leaving a dying Earth.
It looks spectacular, and spotlessly clean, thanks to Emojibots – little robots with smiley faces that have been working tirelessly to create the new settlement.
But something has gone very wrong, meaning any human hugged by an Emojibot becomes a scorched skeleton within seconds!
The Doctor and Bill soon work out why so few people are around, but taking on the small smiley assassins proves one big nightmare…