The Spectrum Cloudbase officers host a non-permitted party, excluding the ultimately strict Colonel White, to celebrate the 1st anniversary of the world security organisation, with the assistance of an anonymous well wisher supplying the champagne, which has in fact been spiked with an organic compound which causes sporadic amnesia and general irresponsibility.
After being severely cautioned by the Colonel, whom discovers the party and becomes very angry at his personnel for not receiving official permission to celebrate the anniversary, the Mysterons announce their intentions to destroy the World Navy Base of Atlantica, an invulnerable underwater complex protected by sea-to-air rockets and offensively-equipped submarines.
Captains Blue and Ochre are handed the assignment to disband a wreckage which is being carried by heavy currents towards the Atlantica base, but the champagne has already taken control over them, turning them into juvenile rebelists.
Captain Black manages to changeover their assignment papers with irrelevant ones which order them to destroy Atlantica's Defence Control Tower, which they proceed in doing, and eventually annihilate the whole complex.