The Tardis arrives on a extinct volcanic island. Before long, the travelers are captured and taken into the depths of the Earth, where they find a hidden civilization, the lost city of Atlantis. The Atlanteans worship a goddess named Amdo and use Fish People, men and women operated upon so that they can breathe under the sea, to farm the plankton-based food on which they survive.

On the planet Terra Alpha, bright fluorescent lights and garish candy-striped colors abound. The population constantly displays happy smiles. There's no sadness on Terra Alpha. Anyone feeling remotely glum disappears. Quickly. Having heard disturbing rumors, the Doctor and Ace arrive to topple the entire regime overnight.

Time traveller Doctor Who, accompanied by Amy Pond and her husband Rory, save the world by fighting aliens and monsters. In their travels they meet another time traveller known as River Song, who has a mysterious relationship to Amy. This release combines the two halves of series six with the 2010 Christmas Special plus hours of bonus material.

The Doctor is locked away in a high-security alien prison. Isolated, alone, with no hope of escape. Far away, on Earth, her best friends, Yaz, Ryan and Graham have to pick up their lives without her. But it's not easy. Old habits die hard. Especially when they discover a disturbing plan forming. A plan which involves a Dalek. How can they fight a Dalek, without the Doctor?