Following on from the events of ‘Crater 101’, Dr. Kurnitz has been
studying the diamond pulsator that Captains Scarlet and Blue and
Lieutenant Green brought back from the moon. Colonel White uses it to
contact the Mysterons to make peace, and the Mysterons agree to a meeting
with one officer in Greenland. Scarlet (as ever) agrees to go.
However, it’s a trap, as everyone suspected, and Scarlet only just
survives the explosion of the Mysterons’ diamond pulsator. Finding
himself without a radio as per the Mysterons’ instructions, Scarlet
drives to a nearby relay station and sends a morse signal to Cloudbase,
just in time for Colonel White to have Captain Ochre throw the pulsator
out of the nearest porthole, saving Cloudbase.