From Big Finish, quote;
"The Mysterons... Sworn enemies of Earth... Possessing the ability to recreate an exact likeness of an object or person... But first, they must destroy... Leading the fight, one man fate has made indestructible... His name: Captain Scarlet.
After Captain Scarlet thwarts an attack on a Spectrum production plant, the Mysterons announce their intention to destroy humanity’s first city on Mars - and Colonel White is kidnapped! Is his abduction part of the latest Mysteron scheme, or is he held captive by a more human force?
With the fate of the world at stake, Captains Scarlet and Ochre must travel to the Mysteron city on Mars - but will they be in time to prevent disaster?
Based on the original TV21 comic strip story, issues 164-166." Unquote
Available here and now: https://www.bigfinish.com/releases/v/captain-scarlet-and-the-mysterons-martian-menace-2866
Rocco
Outpost Gallifrey News
Chicago
"The Mysterons... Sworn enemies of Earth... Possessing the ability to recreate an exact likeness of an object or person... But first, they must destroy... Leading the fight, one man fate has made indestructible... His name: Captain Scarlet.
After Captain Scarlet thwarts an attack on a Spectrum production plant, the Mysterons announce their intention to destroy humanity’s first city on Mars - and Colonel White is kidnapped! Is his abduction part of the latest Mysteron scheme, or is he held captive by a more human force?
With the fate of the world at stake, Captains Scarlet and Ochre must travel to the Mysteron city on Mars - but will they be in time to prevent disaster?
Based on the original TV21 comic strip story, issues 164-166." Unquote

Available here and now: https://www.bigfinish.com/releases/v/captain-scarlet-and-the-mysterons-martian-menace-2866
Rocco
Outpost Gallifrey News
Chicago