Four envelopes, numbered 2, 3 and 4, each containing a date, time and map reference, unsigned, but TARDIS blue. Who sent them? And who received the missing number one? This strange summons reunites the Doctor, Amy, Rory and River Song in the middle of the Utah desert and unveils a terrible secret the Doctor's friends must never reveal to him.

Episode 3 - The Curse Of The Black Spot

The Doctor helps Captain Avery played by Hugh Bonneville and his boatswain played by Lee Ross from Eastenders to fight the mysterious sea creature The Siren played by Lily Cole. The TARDIS is marooned onboard a 17th-century pirate ship whose crew is being attacked by a mysterious and beautiful sea creature.

Episode 4 - The Doctor’s Wife

The Doctor receives a distress signal from an old friend. Could there really be another living Time Lord out there? Hopes raised, he follows the signal to a junkyard planet sitting upon a mysterious asteroid in a Bubble universe, populated by a very strange family.

Episode 5 - The Rebel Flesh &

Episode 6 -The Almost People

A solar tsunami sends the TARDIS hurtling towards a futuristic factory on Earth, where human doppelgangers are used to mine dangerous acid. A second wave hits and the "Gangers" separate. They can remember every second of their "original's" life and feel every emotion they've ever experienced.

Episode 7 - A Good Man Goes To War

Amy Pond has been kidnapped and the Doctor is raising an army to rescue her as the drama continues. But as he and Rory race across galaxies, calling in long-held debts and solemnly given promises, his enemies are laying a carefully concealed trap.

In her cell in Stormcage, River Song sadly acknowledges that the time has come at last – today will mark the Battle of Demons Run and the Doctor's darkest hour.

Episode 8 - Let’s Kill Hitler

In the desperate search for Melody Pond, the TARDIS crash lands in Thirties Berlin. The Doctor comes face to face with the greatest war criminal in the Universe. And Hitler.

Episode 9 - Night Terrors

A little boy called George is terrified of something lurking in his bedroom cupboard. The Doctor receives a strange letter begging “Help me”. Worried Dad teams up with the Doctor to battle his son’s demons but not before Rory and Amy find themselves miniaturised and sucked into the strange doll’s house in George’s cupboard.

Episode 10 - The Girl Who Waited

The Doctor has been in Amy and Rory’s life for a long time now - far linger than he ever intended. What if something were to go wrong? When they step from the TARDIS into a strange white waiting room.

Episode 11 - The God Complex

The Doctor visits a hotel that is a living creature that feeds off people’s fears.The TARDIS lands in what looks like an ordinary hotel, as the time-travelling drama continues. But the walls move, corridors twist and rooms vanish. There is a room for every visitor that contains their deepest, darkest fears. Fears that will kill them. What lies in the Doctor's room? And when his turn comes, will he welcome death like all the rest?

Episode 12 - Closing Time

In the last few days of his life, the Doctor pays a farewell visit to his old friend Craig, and encounters a mystery, as the time-travelling drama continues.

People are going missing, a silver rat scuttles in the shadows of a department store, and somewhere close by the Cybermen are waiting…

Episode 13 - The Wedding of River Song

As the Doctor makes his final journey to the shores of Lake Silencio in Utah, he knows only one thing can keep the universe safe – his own death – in the concluding episode of this series of the time-travelling drama. But has he reckoned without the love of a good woman?

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BBC’s Doctor Who Episode Guide Series 6

Travelling through Time And Relative Dimension In Space, the Doctor & Amy

Starring Matt Smith, Karen Gillan and Arthur Darvill.

Photograph of Karen Gillan as Amy Pond, Matt Smith as the Doctor and Arthur Darvill as Rory Williams.