The TARDIS arrives on the planet Marinus on an island of glass surrounded by a sea of acid. The travellers are forced by the elderly Arbitan to retrieve four of the five operating keys to a machine called the Conscience of Marinus, of which he is the keeper. These have been hidden in different locations around the planet to prevent them falling into the hands of the evil Yartek and his Voord warriors, who plan to seize the machine and use its originally benevolent mind-influencing power for their own sinister purposes.
Directed by John Gorrie
time travel
alien
distant planet
IMDB
N/A
Letterboxd
3.3 / 5
Cast
William Hartnell
The Doctor
Carole Ann Ford
Susan Foreman
Jacqueline Hill
Barbara Wright
William Russell
Ian Chesterton
George Coulouris
Arbitan
Robin Phillips
Altos
Francis de Wolff
Vasor
Anthony Verner
Ice Soldier
Raf De La Torre
Senior Judge
Donald Pickering
Eyesen
Crew
Terry Nation
Writer
Verity Lambert
Producer
Mervyn Pinfield
Associate Producer
Daphne Dare
Costume Design
David Whitaker
Script Editor
Norman Kay
Music
Delia Derbyshire
Theme Song Performance
Popular Reviews
13 reviews
carter canfield
6.0★ · 08/24/24
susan i stg is such a liability in these earlier episodes. the doctor himself remains a little dull, and Ian/barbara prove to be the true goats of early Who.
susan i stg is such a liability in these earlier episodes. the doctor himself remains a little dull, and Ian/barbara prove to be the true goats of early Who.
1
LueC
4.0★ · 01/20/26
This was fine, fell asleep after 25mins tho. Honestly don’t have many thoughts other than the production team really doesn’t like to put men in pants. Also I have never heard poirot pronounced that way ever.
This was fine, fell asleep after 25mins tho. Honestly don’t have many thoughts other than the production team really doesn’t like to put men in pants. Also I have never heard poirot pronounced that way ever.
Portoroghi
7.0★ · 11/29/25
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
Portoroghi
7.0★ · 11/29/25
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
Portoroghi
7.0★ · 11/29/25
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
The exploration aspect of this series was pretty entertaining. There were some really fun characters and costume designs in this one too.
