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25 Episodes 1971 - 1971
Episode 1
25 mins
When a Nestene Energy Unit is stolen and a radio telescope sabotaged, the Doctor is contacted by a Time Lord who tells him his old rival the Master is responsible.

Episode 2
25 mins
Attempting to find out where Jo encountered the Master, the Doctor heads to the circus where he falls foul of Rossini.
Episode 3
24 mins
The Doctor and the Brigadier head to Farrel's factory but the Master and the Autons have already left and are distributing plastic daffodils around the country.

Episode 4
22 mins
The Doctor discovers the plastic daffodils are designed to fire a spray that asphyxiates people, causing havoc prior to the Nestene's arrival, but before he can alert anyone he and Jo are captured by the Master.
Episode 5
25 mins
The Doctor and Jo head to Stangmoor Prison to investigate the Keller Machine, which drains the evil impulses from prisoners' minds, while UNIT are handling security at the first world peace conference.

Episode 6
25 mins
The Doctor is recalled by UNIT to help investigate Cheng-Tiek's murder but is unaware that Chin-Lee is under the control of the Master.
Episode 7
24 mins
Realising Chin-Lee has been using the power of the Keller Machine to carry out assassinations, the Doctor heads back to Stangmoor, only to find the Master has teamed up with Mailer to stage another riot.
Episode 8
25 mins
With the Doctor and Jo being held prisoner, the Master convinces Mailer to help him steal the Thunderbolt.
Episode 9
24 mins
The Doctor is forced to help the Master control the mind parasite while Yates finds out where the Thunderbolt has been taken only to be captured by the Master's men.
Episode 10
25 mins
The Brigadier has recaptured Stangmoor but the Master still has control of the Thunderbolt and the Doctor must find a way to stop him and destroy the Keller Machine.

Episode 11
24 mins
When a mysterious object lands near the Nuton power complex, UNIT investigate and encounter the Axons, a group of aliens who offer the mineral axonite, which can duplicate matter, as a gift.
Episode 12
24 mins
The Doctor and Winser begin to analyse axonite while Chinn plots to secure its use exclusively for Britain.
Episode 13
24 mins
The Doctor and Jo are being held prisoner by Axos while Chinn is forced to organise the worldwide distribution of axonite and the Master returns to the power complex to try and steal the TARDIS.
Episode 14
25 mins
The Doctor and Jo escape from Axos but then the Doctor offers the Master a deal:if he helps him repair the TARDIS, they can flee Earth together.

Episode 15
24 mins
The Time Lords take control of the TARDIS and the Doctor and Jo arrive on an Earth Colony in the 25th Century, where a ruthless mining company is using a dinosaur-like creature to force the colonists to leave the planet. The Doctor and Jo learn that The Master is on the planet and is in search of a doomsday weapon that is hidden somewhere on the planet.
Episode 16
23 mins
The Doctor discovers an Interplanetary Mining Corporation ship has landed on the planet in order to mine its duralinium, while Norton begins causing trouble at the colony.
Episode 17
24 mins
The Doctor makes it back to the colony and warns Ashe what Dent is up to but when Jo and Winton try to find proof they are captured.
Episode 18
24 mins
The Doctor descends into the Primitive city to try and find Jo while the colonists receive a visit from the Adjudicator.
Episode 19
25 mins
The Master offers to help the colonists in exchange for information on the Primitive city and forces the Doctor to act as a guide by taking Jo hostage.
Episode 20
25 mins
The Doctor and the Master are taken into the Primitive city, where the Master hopes to find the doomsday weapon, while Dent forces the colonists to leave the planet even though their ship is likely to explode.
Episode 21
25 mins
For 200 years the secret of Devil's End village has lain dormant, as the burial mound, the so-called Devil's Hump, has remained sealed. Until now, at midnight on April 30th on the greatest occult festival of the year, as Professor Horner prepares to break it open. But just what evil treasures lie buried there? Will the local white witch's warnings of doom and destruction be fulfilled? Who or what is the mighty Azal? But even more disturbing for the Doctor and Jo, just how is the Reverend Magister, alias the infamous Master, involved in the mystery?
Episode 22
24 mins
With the Doctor frozen by the energy release from the barrow, Jo calls Yates and Benton for help, but when the Brigadier tries to join them he finds the village surrounded by a heat barrier.

Episode 23
24 mins
The Doctor explains to his friends that the Master is trying to gain the power of the last of the Daemons, a race who influenced Earth's development, while the Master brings the rest of the village under his control.
Episode 24
24 mins
The Master orders Bert to set a trap for the Doctor at the village while a concussed Jo makes for the cavern.
Episode 25
24 mins
The Master decides to sacrifice Jo to Azal and when the Doctor and his friends try to intervene they come under attack from Bok.