(Image credit: BBC/Simon Ridgway/Stuart Manning)

The Doctor and his new companion Bill arrive on a planet with a super sparkling space age city where they come across robots with a smile. They may look cute but they're in fact deadly killers...

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 which is a housing development of the future that humans will be able to colonise in peace and harmony after evacuating a dying Earth.

It looks spectacular, and spotlessly clean, thanks to Emojibots – little robots with smiley faces that have been working tirelessly, with swarms of micro-robots called Vardies, to create a wondrous new settlement for new earthling arrivals. But something has gone seriously wrong, meaning any human that gets 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…

The Royle Family's Ralf Little turns up towards the end of the adventure. He plays Steadfast, a human colonist who's arrived at the wondrous space age city, but learns that most humans have been wiped out by the Emojibots. When the Doctor and Bill eventually catch up with Steadfast and a small group of humans, they all band together to take on the deadly robotic enemies. Steadfast has access to guns and assault weapons, but will they be of use against such an unusual foe?

Nicholas Cannon
TV Content Director on TV Times, What's On TV and TV & Satellite Week

I'm a huge fan of television so I really have found the perfect job, as I've been writing about TV shows, films and interviewing major television, film and sports stars for over 25 years. I'm currently TV Content Director on What's On TV, TV Times, TV and Satellite Week magazines plus I previously worked on Woman and Woman's Own in the 1990s. Outside of work I swim every morning, support Charlton Athletic football club and get nostalgic about TV shows Cagney & Lacey, I Claudius, Dallas and Tenko. I'm totally on top of everything good coming up too.