The TARDIS lands on the planet of Marinus, a world where the beaches are glass and the sea is acid. The planet is controlled by the Conscience, although four of the five operating keys have been lost. Arbitan, Keeper of the Conscience, captures the TARDIS and forces the Doctor and his crew to search for the keys.
Their quest takes them to many differnt places on Marinus, including the futuristic city of Morphoton, a deserted jungle, an ice-bound wilderness, and the city of Millenius.
On their return they find Arbitan has been killed by Yartek, leader of the Voord. Yartak forces Ian to hand over the keys that have been retrieved. One of the keys that Ian hands over is a fake, and when used the Conscience of Marinus explodes, killing Yartak and the Voords and freeing the people of Marinus from control.
Regular castSusan Foreman: Carole Ann Ford; Barbara Wright: Jacqueline Hill; Ian Chesterton: William Russell;
Guest castArbitan: George Couloris; Sabetha: Katherine Schofield; Yartek: Stephen Dartnell; Altos: Robin Phillips; Arrius: Edmund Warwick; Vasor: Francis de Wolff; Tarron: Henley Thomas; Voords: Martin Cort, Peter Stenson, Gordon Wales; Voice of Disembodied Brains: Heron Carvic; Ice Soldiers: Alan James, Anthony Verner, Peter Stenson, Michael Allaby;
|BBC 1||21||The Sea Of Death||Sat 11 April 1964||5:30 pm - 5:55 pm||9.9M||52nd|
|BBC 1||22||The Velvet Web||Sat 18 April 1964||5:30 pm - 5:55 pm||9.4M||25th|
|BBC 1||23||The Screaming Jungle||Sat 25 April 1964||5:30 pm - 5:55 pm||9.9M||22nd|
|BBC 1||24||The Snows Of Terror||Sat 2 May 1964||5:30 pm - 5:55 pm||10.4M||20th|
|BBC 1||25||Sentence Of Death||Sat 9 May 1964||5:15 pm - 5:40 pm||7.9M||29th|
|BBC 1||26||The Keys Of Marinus||Sat 16 May 1964||5:15 pm - 5:40 pm||5.9M||43rd|
This programme does not have any outside filming
Ealing Television Film Studios; Lime Grove Studio D;
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