Clara's not actually dead, but that should surprise no one. She wakes up hanging upside down outside the Dalek city with Missy, who explains that they were able to escape by using the energy emitted from the Daleks' weapons to teleport themselves away through the use of vortex manipulators which they had also used to find the Doctor previously. But what this also causes is that the devices are destroyed in the process.

The Doctor forces Davros out of his wheelchair to use in to break into the room containing the Supreme Dalek is. The wheelchair generates a force-field that protects the Doctor from the Daleks firing at him. He tries to force the Daleks to return Clara to him but they still believe Clarak is dead. Sarff sneaks up on the Doctor and knocks the Doctor out.

Missy and Clara have snuck back into the city through a Dalek sewer where defective and broken down Dalek mutants are sent as they are no longer of use. Missy tricks Clara into triggering an alarm before handcuffing her to a wall to bait a Dalek. Missy then injures that Dalek so the mutant Daleks will attack it for being abandoned. Once it is destroyed, Missy tells Clara to get into the Dalek casing so they can sneak back into the main area of the city. When Clara is hooked up to the Dalek system, any declaration of her name will translate outwardly as "I am a Dalek," and any emotional sentiment will translate as "Exterminate."

The Doctor wakes in the infirmary where Davros informs him that the life-support cables surrounding them are connected to every Dalek on Skaro and it is their combined life-force that keeps Davros alive. Davros tries to goad the Doctor into destroying every Dalek by way of the cables but the Doctor won't do it. The Doctor shares how he willingly came to see Davros due to the compassion he felt for his sickness. The Doctor shares how Gallifrey was not actually destroyed and Davros congratulates him on this before seeking moral advice on whether or not he was right to create the Daleks. But it's not long before Davros' health begins to further wither. He shares how he wants to the the sun rise once more so the Doctor tries to rewire the life-support system to allow this, but it isn't enough. The Doctor releases a small bit of Time Lord regeneration power into the cables to help restore Davros' health but the Doctor finds himself trapped in Davros' scheme to get this Time Lord energy into every Dalek on Skaro.

As each Dalek grows more powerful, Missy becomes alarmed while Clara is left confused and still trapped inside the Dalek system. Hybrid creatures are created from the Daleks combined with the Time Lord energy. This was something that had been referenced in Gallifreyan mythology and Davros believes that this is the true reason that the Doctor had ran from Gallifrey. Meanwhile, Missy breaks into the room to save the Doctor and kills Sarff to do it.

The Doctor, now free from the system, tells Davros that he knew his plan the whole time and this regeneration energy also revitalised the defective Daleks in the sewer, who have now begun breaking through the city's reface and promptly begin attacking the function Daleks as vengeance. Clara in the Dalek casing tries to tell the Doctor that she is trapped inside and Missy tries to trick the Doctor into killing the Dalek in revenge, claiming that it killed Clara. All the statements are translating into "I am a Dalek" but when Clara pleads for mercy, the Doctor says that "mercy" is not a word that should be in Dalek vocabulary so he tells the Dalek to think "open" and the casing will open. Clara does this and the Doctor frees her. While pondering how it was that the Dalek had a concept of mercy, he order Missy to run. She does so and once she is cornered by some Daleks, she declares that she's just had "a very clever idea."

The Doctor summons the TARDIS with his new sonic sunglasses, as the TARDIS had used its Hostile Action Displacement System. The Doctor and Clara watch from a safe distance as the city is destroyed and the Doctor once again tries to determine how the Dalek system was able to ask for mercy. He then realises what he must do and goes back to see young Davros. Using the Dalek gun, he shoots all the hand mines surrounding the young Davros. Davros asks the Doctor which side he is fighting for in the war, and the Doctor tells him that side don't matter, so long as there is always mercy. He then takes Davros home.

Doctor Who airs on Saturdays on BBC One at 9PM.

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A battle is underway in an unknown war. A boy gets trapped in a field of "handmines," which are creatures that are hands with eye that drag their victims underground. The Doctor shows up and tosses his sonic screwdriver to the boy to try to save him, but is shocked when the boy says his name is Davros (the eventual creator of the Daleks).

Some centuries later, an alien creature named Colony Sarff who serves Davros, visits various planets in search of the Doctor. Sarff even visits the headquarters of the Shadow Proclamation, an intergalactic police force, as well as the planet Karn. Sarff has a message for the Doctor, that Davros is dying and that he "knows" and "remembers." Sarff visits Davros, whose condition is worsening rapidly, and delivers the bad news that he has not found the Doctor. Davros still possesses the Doctor's sonic screwdriver, and pushes Sarff to track down the Doctor's friends in the hopes that they will be able to help track him down.

Clara is teaching her class when she notices that a plane is frozen in the sky. As is turns out, planes worldwide are frozen in place. She is summoned to the Tower of London by UNIT to try to get hold of the Doctor. She also learns that the planes haven't stopped but are frozen in time, thus no one on board can be contacted. UNIT receives a message on a channel specifically created for the Doctor to use but the message is actually from Missy.

Clara goes to meet Missy at an open-air café, who admits to freezing the planes due to her pressing need to contact the Doctor. Missy shows Clara the Doctor's confession dial, which is the Time Lord equivalent to a last will and testament. They are typically delivered on the day prior to a Time Lord's death and had been sent directly to Missy, not Clara. Missy believes that this means that the Doctor believes he only has one day to live and she is concerned for him, believing him to be her friend albeit one with whom she has an immensely complicated relationship with.

Missy and Clara track the Doctor down to Essex in the year 1138 where the Doctor has spent the last three weeks "partying," and bringing forth a number of items out of place in that time period, including an electric guitar, tank, and fish. The Doctor is reunited with Missy and Clara but then Sarff appears, having followed the women. He reveals that he is a colony creature made up of one large snake plus several smaller ones, though he normally wears a robe to take on a more humanoid appearance. Sarff threatens the safety of everyone in the arena but the Doctor shuts his threats down, prompting Sarff to deliver Davros' message and returns the sonic screwdriver.

It's revealed through flashbacks that the Doctor had abandoned Davros when he was trapped in the handmines. The Doctor feels great shame for his actions and agrees to go with Sarff as his prisoner, despite Missy and Clara's objections, though they insist on coming along as prisoners too. Bors, the medieval man with whom the Doctor had been interacting, is revealed to be a Dalek puppet and procures the Doctor's TARDIS for the Daleks.

Sarff brings the prisoners to a space station, the Doctor is brought forth to Davros. Missy tells Clara that there's something off with the gravity and it doesn't feel artificial the way it would on a space station. They step outside and find they are on a planet and the Doctor begins to figure the same thing out as them: that they are on Skaro, the home planet of the Daleks.

Missy and Clara are captured by Daleks and brought to the room where the TARDIS is being kept. The Daleks intend on destroying it and Missy offers to help the Daleks utilise it instead of destroying it but they seemingly exterminate her before doing the same to Clara, though the Doctor had pleaded for her life but Davros says he can't control them. The Doctor expresses remorse for not destroying Davros when he had the chance and the loss of his friends. Davros wants the Doctor to admit that his greatest indulgence, compassion, is wrong.

Finally, we see the Doctor once again at the handmine field and meeting young Davros, who asks if the Doctor will save him. The Doctor says he will save his friend the only way he can, "Exterminate," while aiming a Dalek gun at young Davros.

Doctor Who airs on Saturdays on BBC One at 9PM.

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