Doctor Who: The Keys of Marinus 59 years old

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.

Credits

Doctor Who: The Keys of Marinus Cast

Name	Character
William Russell	as Ian Chesterton
William Hartnell He was 56, 67 years old when he died	as The Doctor
Jacqueline Hill She was 34, 63 years old when she died	as Barbara Wright

Doctor Who: The Keys of Marinus Crew

Name	Department