Red Dwarf Season 3 Episode 4

Lister asks a malfunctioning dispenser unit for a Toffee Crisp and triggers the ship’s self-destruct sequence, the only way out being a “body swap” with a dead, high-ranking officer. Inspired, Rimmer suggests a two-week trade: Lister’s body for his, the sweetener being that he’ll return it in tip-top physical condition. Unfortunately, the pleasures of the flesh prove too much for the weak-willed hologram, the fitness regime descending into an orgy of binging and self-abuse.