by Shane Rimmer
"Within the next four hours we will destroy key links in your Frost Line Outer Space defence system."
While en route to Red Deer Base, a military installation located in the snowy wastes of Northern Canada, a maintenance truck driver named Eddie is killed and then Mysteronised. Meanwhile, the Frost Line commander, General Ward, promises massive retaliation against the Mysterons if any of his installations are attacked; Colonel White is concerned about the consequences of a strike against Mars, and so sends Captain Scarlet and Lieutenant Green to the base. But when Captain Scarlet and Lieutenant Green arrive they discover that there have been a number of inexplicable deaths of personnel; the radiation and toxicity levels read negative and there appears to be no reason for the deaths...
Francis Matthews (Captain Scarlet), Ed Bishop (Captain Blue), Donald Gray (Colonel White), Cy Grant (Lieutenant Green), Donald Gray (Voice of the Mysterons), Liz Morgan (Rhapsody Angel / Destiny Angel), Paul Maxwell (Captain Grey / General Ward), Lian Shin (Harmony Angel), Gary Files (Eddie / Trapper / 3rd Sentry), Charles Tingwell (Marshall), Jeremy Wilkin (Lt. Burroughs / Radio), Martin King (1st Sentry [Joe] / 2nd Sentry)
Directed by Brian Burgess
Produced by Reg Hill
Executive Producer Gerry Anderson
UK (ATV Midlands):
October 27th, 1967 @ 5.25 pm - 5.55 pm
*Featuring Captain Scarlet, Captain Blue, Colonel White, Lieutenant Green, Rhapsody Angel, Destiny Angel and Harmony Angel