The Doctor tangles with scientists threatening to destroy the world. Robot: Michael Kilgarriff. Benton: John Levene. Kettlewell: Edward Burnham. Sarah: Elisabeth Sladen.

The Doctor bids farewell to Amy and Rory; statues in New York come to life.

The Krynoid unites the vegetables against the animal world. Tom Baker, Elisabeth Sladen. Chase: Tony Beckley. Scorby: John Challis. Krynoid's Voice: Mark Jones. Thackeray: Michael Barrington. Amelia Ducat: Sylvia Coleridge.

The Doctor and Clara land on a damaged Russian Submarine in 1983 as it spirals out of control into the ocean depths.

Part 1 of 2. The Doctor, Martha and Captain Jack arrive in the U.K. as the Master assumes his post as Prime Minister Harold Saxon and delivers a startling announcement to the world. Sharon Osbourne makes a cameo appearance. John Barrowman. John Simm.

The Doctor (Matt Smith) offers a heart-breaking farewell to Amy and Rory.

The Doctor’s search for Clara Oswald brings him to modern day London, where wifi is everywhere. Humanity lives in a wifi soup. But something dangerous is lurking in the signals, picking off minds and imprisoning them. As Clara becomes the target of this insidious menace, the Doctor races to save her and the world from an ancient enemy.

A scientist activates a crystal that ages an assistant 60 years.

The Doctor takes Clara to the rings of the planet Akhaten, where the Festival of Offerings is in full swing. Clara meets the Queen of Years, but she soon learns that a sacrifice will be demanded at the festival.

The Doctor and Clara land on a Russian nuclear submarine in 1983 as it spirals into the ocean depths with an alien creature creating havoc on board.

The Doctor and Clara land on a Russian nuclear submarine in 1983 as it spirals into the ocean depths with an alien creature creating havoc on board.

The Doctor and Clara visit an isolated mansion located on a moor that is allegedly haunted. There, they meet a ghost hunter and a psychic who are searching for the Witch of the Well.

Bodies are found in Victorian Yorkshire with skin that is waxy and glowing red.

The Doctor and Clara arrive at the dilapidated theme park Hedgewick's World and are confronted by the Cybermen.

The seventh series ends with the discovery of a secret the Doctor planned on taking to his grave.

Donna and the Doctor face their greatest challenge yet as they learn whether established history can be changed. Finding themselves in 79AD, the time travellers discover beasts of stone running riot in the streets of Pompeii. With guest stars Peter Capaldi (The Thick of It), Phil Davis (Whitechapel) and future companion Karen Gillan

At a haunted mansion, Clara and the Doctor join the hunt for the Witch of the Well.

The TARDIS crash lands in 1930's Berlin, bringing the Doctor face to face with the greatest war criminal in the Universe. And Hitler.

Every child is scared of monsters, but George's terrified pleas for help reach the Doctor. Because George's monsters are real.

The Time Lord takes Donna far into the future, visiting her first alien world. The duo discover shocking truths about the human race while on the planet Ood-Sphere, as the enslaved inhabitants struggle for survival. Tim McInnerny guest stars alongside David Tennant and Catherine Tate

Amy is trapped in a quarantine facility for victims of an alien plague. Can Rory save her before she is killed by kindness?

The TARDIS lands in a hotel where every visitor's room contains their deepest, darkest fears. What lies in wait in the Doctor's room?

The seventh season ends with the discovery of a secret the Doctor planned on taking to his grave.

The Doctor's final days are upon him - but when he drops in on an old friend, the Cybermen are waiting.

By the shores of Lake Silencio, in Utah, all of time and space hang in the balance - because this is the day the Doctor dies.

Evacuated to a house in Dorset from war-torn London, Madge Arwell and her two children, Lily and Cyril, are greeted by a madcap caretaker whose mysterious Christmas gift leads them into a magical wintry world.

Kidnapped by his oldest foe, the Doctor is forced on an impossible mission - to a place even the Daleks are too terrified to enter...

An unmanned spaceship hurtles towards certain destruction - unless the Doctor can save it, and its impossible cargo... of dinosaurs!

The Doctor gets a Stetson and a gun, and finds himself the reluctant Sheriff of a Western town under siege by a relentless cyborg.

The Doctor and his new companion, Clara, fight to save Christmas from the villainous Doctor Simeon and his army of evil snowmen.