Lister falls ill after snooping through Kristine Kochanski's quarters, which have not been decontaminated. The pneumonia he contracts is a mutated strain and, while delirious, he has three hallucinations which become solid: fish rain in his sleeping quarters; the Mayor of Warsaw spontaneously combusting; and two guests who materialise in the drive room. These guests are Lister's Confidence, a tall, tanned, flashily-dressed game show host type who calls Lister "the King", and Lister's Paranoia, a pallid little man who greets him with "Isn't that a urine stain on the front of your trousers?".
Although Rimmer warns that the two are symptoms of Lister's disease and therefore dangerous, Lister begins spending a lot of time with his Confidence, who helps him figure out where Rimmer has hidden Kochanski's hologram disk (it's in the solar panels outside their sleeping quarters). Rimmer is proved correct, however, when Confidence murders Paranoia and later tries to persuade Lister to remove his helmet while spacewalking. To prove that "Oxygen is for losers!" Confidence removes his own helmet, then explodes.
Lister, having successfully retrieved the disk, nervously rehearses his first words to Kochanski. When he switches on the program, however, a second Rimmer appears.