The Doctor and Clara have to face their last ever Christmas - they find themselves trapped on a arctic base and under attack from terrifying creatures. They soon realise the only person who can save them is Santa Claus.
After his regeneration, the Doctor arrives in Victorian London and finds a dinosaur running rampant in the Thames. While adjusting to his new body, he becomes aware of a spate of deadly spontaneous combustions and tries to work out the link between the two.
The commander of a hospital ship in the far future asks the Doctor to help treat a most unusual patient: a Dalek. The Doctor sets out to reform it but must soon question his own prejudices concerning his mortal enemies.
The Doctor takes Clara to Nottingham in the 12th century, so that she can see that Robin Hood is merely a legend with no basis in reality. However, when they arrive they discover that Robin is alive and well... and so is the Sheriff of Nottingham, who is conspiring with alien robots to conquer England.
The Doctor decides to determine why all beings share a fear of a creature under the bed. His quest for knowledge will take him to the end of the universe to rescue a stranded time traveler who may hold the secret to the mystery.
The Doctor answers the TARDIS' telephone... and finds himself and Clara mind-wiped and preparing to rob the most impregnable bank in the universe for an unknown prize.
Much to Clara's dismay, the Doctor goes undercover at Coal Hill School to track down the Skovox Blitzer, which is preparing to destroy Earth.
The Doctor and Clara find themselves on a space shuttle about to take part in a suicide mission to the Moon. When they crash land, they find themselves facing a dilemma. When Clara turns to the Doctor for help, she is shocked.
The Doctor and Clara travel on the most beautiful train in history, as it makes its way through the stars of the future. They soon discover that a deadly creature is on board stalking the passengers.
With the Doctor trapped in a shrinking TARDIS, Clara is forced to deal with the alien menace responsible, which strikes from the second dimension to the third with fatal consequences.
The human race wakes up to face the most surprising worldwide invasion yet. A forest has grown in every city to take back the Earth. The Doctor soon realizes that the last days of humanity have arrived.
Plans have been drawn up in the Nethersphere. Missy will soon be about to meet the Doctor, with a impossible choice to make. The Doctor and Clara discover that the sinister organisation known as 3W have plans.
The Cybermen are on the streets of London as old friends unite against former enemies. UNIT attempt to contain Missy, and the Doctor has to face his greatest challenge as sacrifices have be made before the day is won.