One fateful night in New York City, the Doctor inadvertently causes a young boy to gain superpowers. Returning years later on the trail of the shady Harmony Shoal Institute, he finds the boy all grown up as masked superhero The Ghost.

The Doctor and Nardole team up with a university student to take down a sinister life-mimicking alien.

The Doctor brings Bill to a future human colony, where cute EmojiBots work as willing servants and make sure everybody's happy, but if they're not happy ,they're harvested, so Bill and The Doctor better smile, or else.

The Doctor and Bill visit London during the last of the River Thames frost fairs in February 1814. They soon discover that there is something under the ice which is causing people to disappear.

Bill is moving in with some friends and they've found the perfect house rented by the landlord. The wind blows, the floorboards creak and the Doctor thinks something is very wrong.

When the Doctor, Bill and Nardole become trapped on a space station without oxygen, they discover the spacesuits are trying to kill them.

The Doctor is called by the Vatican to solve the mystery of a text called the Veritas, that when someone reads it dies soon after. But something is dwelling in the Vatican, and doesn't want the Veritas to be read.

A 5,000-year-old pyramid appears overnight, baffling everyone including The Doctor.

Earth is invaded and Bill is living alone in occupied Britain. The Doctor appears to be on the side of the enemy, flooding the airwaves with fake news. Bill and Nardole embark on a deadly mission to rescue the Doctor and lead the resistance against the new regime, whatever the cost.

The Doctor, Bill and Nardole discover a tomb of the Queen of the Ice Warriors on Mars in 1881.

A long time ago, the Roman legion of the ninth vanished into the mists of Scotland. Bill has a theory about what happened, and the Doctor has a time machine. But when they arrive in ancient Aberdeenshire, what they find is a far greater threat than any army. In a cairn, on a hillside, is a doorway leading to the end of the world.

Trapped on a giant spaceship, caught in the event horizon of a black hole, he witnesses the death of someone he is pledged to protect. Are events already out of control?

The Doctor makes a final stand against an army of Cybermen to protect a tiny band of humans from destruction.