Where To Stream Captain Scarlet and the Mysterons Season 1 Episode 5

The Frost Line Outer Space Defence System is endangered by the Mysterons when they destroy a maintenance truck, murdering its engineer/driver in the process, as a cover to infiltrate the defence bases sited in Northern Canada, where the Mysteronised engineer intends to proceed in removing all oxygen from the bases' self-contained atmosphere. With bases' "Red Deer" and "Cariboo" already taken down, the next base in the ring, "Big Bear", is the Mysterons' final target. But if the base is attacked...