In this episode, young Ned Seagoon, while walking the streets of London during a particularly thick "pea-souper" fog, accidentally bumps into Minnie Bannister and realizes he's lost. Using a burning torch, he becomes the leading London guide for vehicles lost in the fog. Frustrated by the difficulty of finding his way around in the fog, he drops into Parliament to complain. Ultimately, he volunteers for a government-sponsored experimental unit to get rid of the fog.