The Doctor and Charley travel to the remote Cimmerian System to unravel the mystery of its sun. But darkness has already embraced the scientific base on Cimmeria IV in more ways than one. In a fight for survival, the Doctor must use all his wits against a deadly artificial lifeform and an ancient race whose return to the Cimmerian System threatens suffering and death on an apocalyptic scale. Written and directed by Nicholas Briggs.

Hallowe'en 1938. A year after a mysterious meteorite lit up the skies of New York State, Martian invaders laid waste to the nation. At least, according to soon-to-be infamous Orson Welles they did. But what if some of the panicked listeners to the legendary War of the Worlds broadcast weren't just imagining things? Attempting to deliver Charley to her rendezvous in Singapore in 1930, the Doctor overshoots a little, arriving in Manhattan just in time to find a dead private detective.

Twas the night before Christmas, and all through the house not a creature was stirring.... But something must be stirring. Something hidden in the shadows. Something which kills the servants of an old Edwardian mansion in the most brutal and macabre manner possible. Exactly on the chiming of the hour, every hour, as the grandfather clock ticks on towards midnight. Trapped and afraid, the Doctor and Charley are forced to play detective to murders with no motive, where even the victims don't stay dead.

The web of time is stretched to breaking. History is leaking like a sieve. In the Citadel of Gallifrey, the Time Lords fear the end of everything that is, everything that was...everything that will be. The Doctor holds the Time Lords' only hope - but exactly what lengths will the Celestial Intervention Agency go to in their efforts to retrieve something important from within his TARDIS? What has caused Imperiatrix Romanadvoratrelundar to declare war on the rest of creation? And can an old nursery rhyme about a monster called Zagreus really be coming true?

The Doctor and Charley decide to take a well-deserved break from the monotony of being chased, shot at and generally suffering antisocial behaviour at the hands of others. And so they end up in Venice, well into Charley's future, as the great city prepares to sink beneath the water for the last time...which would be a momentous, if rather dispiriting, event to witness in itself.