Rose finds herself further away from home than ever before, on a desolate world in the orbit of a Black Hole. Trapped with an Earth expedition and the mysterious Ood, the time-travellers face an even greater danger as something ancient beneath the planet's surface begins to awake.
The Doctor, Rose and Mickey return to 2007 after the TARDIS malfunctions, but discover that they arrived in an alternative timeline, where Earth is a fascist society and Rose's parents are still together. This Earth, however, is under threat of invasion from the Cybermen!
Madame de Pompadour finds the court at Versailles under attack from sinister clockwork droids. Her only hope of salvation lies with the man who has haunted her dreams since childhood – a mysterious stranger known only as the Doctor. Can a broken clock summon the Lord of Time?