As of July 2026, Doctor Who Season 4 aired in 1966 with 43 episodes — streaming now on BritBox. Full episode guide and where to watch below.
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Doctor Who Season 4

1966 43 Episodes Drama · Action & Adventure ⭐ 8/10

Doctor Who Season 4 has built a real following on and among viewers who want their sci-fi to think as hard as it looks. A single, tightly-focused season means there is plenty to get through without ever feeling padded. An 8/10 rating says what the writing already makes obvious: this one works. Watch it for Patrick Troughton — the performance elevates material that could easily tip into self-seriousness. Available now — press play and find out why people keep recommending it.

Part of the current wave of titles people are actually watching, Doctor Who Season 4 earns its spot. Doctor Who Season 4 treats its concept seriously enough to follow it all the way through. This season was a season of major changes for Doctor Who, including some that have influenced the series and franchise ever since. Most notably, season 4 saw William Hartnell's First Doctor hand off the baton to Patrick Troughton's Second Doctor in the very first regeneration. When Hartnell announced his plans to leave the series, the show's writers came up with the idea of having the Doctor change his appearance and personality. Patrick Troughton leads a cast that brings real weight to the material. It was aired in 1966. The world-building is meticulous enough to sustain multiple rewatches, with details early on that only make sense later. It rarely drops the ball, and when it does, it recovers fast.

Viewers burned by ambitious sci-fi that could not sustain its premise should give Doctor Who Season 4 a chance. If you have run out of similar titles to watch, this is a strong next pick. Best experienced as a single, sustained watch if your schedule allows. Patrick Troughton anchors it with a performance that makes the more abstract moments feel personal. If you have been burned by ambitious sci-fi before, this is the exception.

📡 Where to Watch Doctor Who Season 4

🇦🇺 Australia
🇺🇸 United States
🇬🇧 United Kingdom
🇨🇦 Canada
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🎬 Doctor Who Season 4 — Episode Guide

E1
The Smugglers (1)
1966-09-10
The Doctor discovers Polly and Ben aboard the TARDIS shortly before the ship arrives in 17th century Cornwall, where the local churchwarden gives the Doctor a cryptic message shortly before being murdered.
E2
The Smugglers (2)
1966-09-17
Pike is convinced that the Doctor knows the location of Avery's treasure while Polly and Ben try to convince the locals they were not responsible for Longfoot's murder.
E3
The Smugglers (3)
1966-09-24
Polly and Ben are placed in the custody of Blake, who reveals he also has his suspicions about the Squire, while the Doctor and Kewper are forced to team up to escape from Pike's ship.
E4
The Smugglers (4)
1966-10-01
The Doctor and his friends are at the mercy of Cherub, who is now seeking Avery's treasure for himself, while Pike prepares to attack the village.
E5
The Tenth Planet (1)
1966-10-08
In 1986 a new planet appears in the Solar System which turns out to be a long-lost twin of Earth's named Mondas. Its inhabitants are the Cybermen.
E6
The Tenth Planet (2)
1966-10-15
The Doctor's warnings are ignored and the Cybermen take over the base, hampering the crew's efforts to help Zeus IV.
E7
The Tenth Planet (3)
1966-10-22
With the Doctor out of action, it is up to Polly, Ben and Barclay to stop Cutler using the Z-Bomb and devastating half the world.
E8
The Tenth Planet (4)
1966-10-29
The Cybermen take over the base again, apparently to stop the humans using the Z-Bomb, but then the Doctor realises they intend to use it themselves to destroy Earth.
E9
The Power of the Daleks (1)
1966-11-05
The TARDIS arrives on the Earth colony of Vulcan where the newly-regenerated Doctor assumes the identity of an Earth Examiner.
E10
The Power of the Daleks (2)
1966-11-12
While the Doctor worries about the inert Daleks in the capsules, Lesterson makes plan to reactivate one of them.
E11
The Power of the Daleks (3)
1966-11-19
The Doctor fails to convince the colonists of the danger posed by the Daleks and soon the other two are also reactivated.
E12
The Power of the Daleks (4)
1966-11-26
With Polly being held prisoner by the rebels, the Doctor and Ben decide to investigate them, while Lesterson discovers the Daleks are reproducing.
E13
The Power of the Daleks (5)
1966-12-03
The Doctor and Quinn attempt to escape in order to stop Bragen using the Daleks to take over the colony.
E14
The Power of the Daleks (6)
1966-12-10
With Bragen having taken over, the Daleks trick the rebels into turning them loose and only the Doctor can stop them wiping out the entire colony.
E15
The Highlanders (1)
1966-12-17
The Doctor, Polly and Ben arrive in 1746, in the aftermath of the Battle of Culloden, and are captured by a group of Highlanders shortly before they themselves are captured by redcoats.
E16
The Highlanders (2)
1966-12-24
Polly and Kirsty capture Lieutenant Ffinch to try and enlist his help while the Doctor tricks Grey in order to escape.
E17
The Highlanders (3)
1966-12-31
With the Highlanders imprisoned aboard Trask's ship, the Doctor attempts to expose Grey's plan.
E18
The Highlanders (4)
1967-01-07
Ben manages to join up with the Doctor, Polly and Kirsty and together they work to free the Highlanders from Trask's ship before Grey sells them into slavery.
E19
The Underwater Menace (1)
1967-01-14
The TARDIS materialises on a deserted beach where the Doctor and his friends are captured by primitive warriors and taken to the fabled city of Atlantis.
E20
The Underwater Menace (2)
1967-01-21
While Ara tries to save Polly from being turned into a Fish Person and Ben and Jamie try to escape from the mines, the Doctor discovers the full extent of Zaroff's plans.

🎭 Cast of Doctor Who Season 4

Patrick Troughton
Patrick Troughton
The Doctor

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