Doctor Who (1963–1989)
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The Keys of Marinus 

The Doctor and his friends must locate the real murderers and the fourth key before heading off for a final confrontation with the Voord.


John Gorrie


Terry Nation




Episode cast overview:
William Hartnell ... Dr. Who
William Russell ... Ian Chesterton
Jacqueline Hill ... Barbara Wright
Carole Ann Ford ... Susan Foreman
Robin Phillips ... Altos
Katherine Schofield ... Sabetha (as Katharine Schofield)
Alan James Alan James ... Guard
Fiona Walker ... Kala
Donald Pickering ... Eyesen
Henley Thomas Henley Thomas ... Tarron
Michael Allaby Michael Allaby ... Larn
Stephen Dartnell Stephen Dartnell ... Yartek
Martin Cort Martin Cort ... Voord
Peter Stenson Peter Stenson ... Voord


The Doctor and his friends must locate the real murderers and the fourth key before heading off for a final confrontation with the Voord.

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Did You Know?


Donald Pickering has said in interviews he does not recall working on this project at all. See more »


An inlay shot against a black background is used to create the appearance of teleportation. This technique is revealed by the appearance of the characters' shadows against a pillar after they have "teleported" - the shadows also reveal the actors scurrying off the set afterwards. See more »


Barbara Wright: Hello.
Susan Foreman: I want to speak to Barbara Wright.
Barbara Wright: Susan?
Susan Foreman: Barbara, they made me call you.
Barbara Wright: Who Susan? Who?
Susan Foreman: Barbara, listen they were...
Barbara Wright: Susan?... Susan?... Are you there, Susan?
Susan Foreman: They're going to kill me.
Barbara Wright: Susan!
See more »


Referenced in The Watch-A-Thon of Rassilon: The Keys of Marinus (2015) See more »

User Reviews

The Keys of Marinus: Part 6 - Various locations and adventures varying in quality

Review for all 6 episodes:

This story from Dalek creator Terry Nation begins with the episode the Sea of Death. It is in my view an excellent opening episode. It features an intriguing, well written plot with the TARDIS crew searching a strange planet. The design of the planet and its Voord creatures is very good indeed, ideas such as seas of acid and beaches of glass are cleverly used to create a truly interesting and exciting alien planet. The Voord look good, there is menace and suspense, an excellent alien landscape and building design, a proficient script and quality acting all round which gives a 10/10 opening episode to the story.

However, episodes 2-4 are a little disappointing in comparison. The idea of the story means each episode of the first 5 takes place in a different location with a self contained adventure searching for the hidden Keys of Marinus. This really would be a great idea for a story but is a pity when the original world in the opening episode is so well designed. Episode 2 has a hugely different location and features the crew suffering mind control. This second episode is very good in most aspects but a few less impressive aspects such as a minor plot hole cause its quality to suffer. This plot hole is that Barbara is meant to travel, via a kind of teleportation device, just a minute before the rest of the travellers and yet in that minute before they join her numerous things are meant to have happened.

Episodes 3 and 4 are not as interesting or well executed as the first part either with episode 4 the weakest. Episodes 5 and 6 return to a higher standard and are like a murder mystery. Very good but they still are not a match for the top quality first part.

My Ratings: Episode 1 - 10/10, Episode 2 - 8/10, Episode 3 - 7.5/10, Episode 4 - 7/10, Episode 5 - 9/10, Episode 6 - 9/10

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Release Date:

16 May 1964 (UK) See more »

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Aspect Ratio:

1.33 : 1
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