When intelligence agents around the world come under attack from alien forces, MI6 turns to the only person who can help- a certain Doctor and her companions. As they travel the globe in pursuit of answers, threats arrive from all sides, leaving Earth’s security resting on the team’s shoulders. But where will this planet-threatening conspiracy lead them?

The Doctor and her friends discover that the luxury resort where they are holidaying is hiding a number of deadly secrets. What are the ferocious monsters attacking Tranquillity Spa?

1903. On the edge of Niagara Falls, something is wrong at Nikola Tesla’s generator plant. Who or what is sabotaging the maverick inventor’s work? Has he really received a message from Mars? And where does his great rival Thomas Edison fit into these events? The Doctor, Yaz, Ryan and Graham must join forces with one of history’s great minds to save both him and planet Earth.

Ko Sho Blo! Trigger-happy space police the Judoon are targeting 21st-century Gloucester. The Doctor, Yaz, Ryan and Graham race back to Earth in order to prevent them doing too much damage to the cathedral city. But who are they looking for, and what did they do to incur the wrath of the Judoon?

The mysterious “Praxeus” will cause the quartet to split up (never a good idea) to investigate mysteries all over Earth. And what they find will threaten all human life (again).

As Graham, Yaz and Ryan return home to see friends and family, they find themselves haunted by very different experiences. Who is the figure calling from beyond the stars for help, and why? And what are the fearsome Chagaskas terrorising Aleppo in 1380? To find the answers, Team TARDIS must embark on a mission which forces them to face their darkest fears.

Lake Geneva, 1816. Lord Byron and the Shelleys prepare for a night telling ghost stories, but their villa proves to have ghostly presences all its own.

In the far future, the Doctor and her friends face a brutal battle across the farthest reaches of space to protect the last of the human race against the deadly Cybermen.

The Cybermen are on the march. The last remaining humans are hunted down. Lies are exposed, truths are revealed, and for the Doctor nothing will ever be the same.