 Broadcasting to Earth from Lunarville 7, the Lunar Controller declares the Moon an independent world and a neutral power in humanity's war with the Mysterons (voiced by Donald Gray).Colonel White (voiced by Donald Gray) sends Captain Scarlet, Captain Blue and Lieutenant Green (voiced by Francis Matthews, Ed Bishop and Cy Grant) to the colony to present the World President's written response to this surprise announcement.Scarlet, Blue and Green are also ordered to investigate the Humboldt Sea on the Moon's far side, where orbital surveillance indicates that a new, unauthorised colony is being built.