

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.

Doctor Who: Deep Breath
2014

Stargate: Continuum
2008

Babylon 5: The Legend of the Rangers - To Live and Die in Starlight
2002

Doctor Who: The Day of the Doctor
2013

Stowaway
2021

Titan A.E.
2000

Doctor Who: The Snowmen
2012

The Man Who Fell to Earth
1976

Valerian and the City of a Thousand Planets
2017

The Wild Blue Yonder
2005