A carol service on the radio is interrupted by an announcement that the world is going to end at midnight, because the United Nations has decided that this is the best route forward, with the ever-worsening problems of racism, over-population, inflation and pollution.
Meanwhile, Graeme thinks about his accomplishments: Giant Kittens, Monster Cods and Eddie Waring impressions.
As Tim starts to cry, Graeme makes plans to celebrate Christmas at 11:56 PM.
It is revealed that Tim's waistcoat covers what he calls an "A-string", which he then explains is "a G-string that's a bit higher up".
Graeme decides to try to remove Tim's inhibitions, which centre on his belly button.
Then the television reports that with six minutes left until the end of the world, revellers are gathering at Covent Garden, Harrods is having a closing-down sale, and the British Royal Family has fled Earth for a new life on Saturn.
The Goodies share their feelings, worst embarrassments and mutual recriminations with the others, leading to complete personality overhauls for both Tim (who changes clothes completely) and Bill (who shaves his beard off, puts a suit on and takes his pet off his head, purely so that Tim can see him for who he truly is).
The world then explodes (an explosion sound is played with the white background, followed by a BBC1 station ID with the mirror globe spinning until it blows up).