Four further episodes chronicling Captain Scarlet's battle with the dreaded Mysterons. In 'Noose of Ice' Spectrum discover that not even the North Pole is safe from Mysteron attack. 'Expo 2068' has Captain Scarlet and Captain Blue go in search of a hijacked nuclear reactor. 'The Launching' sees President Roberts receive a threat of Mysteron assassination. Whilst 'Codename Europa' finds world-class boffin Professor Carney coming under Mysteron control.