The time travellers arrive in Scotland just after the Battle of Culloden. The Second Doctor gains the trust of a small band of fleeing Jacobites by offering to tend to their wounded Laird, Colin McLaren. While Polly and the Laird's daughter, Kirsty, are away fetching water, he and the others are all captured by Redcoat troops commanded by Lieutenant Algernon Ffinch.

In the bleak days of 1983, the Crimson Permanent Assurance, an accountancy staffed by elderly workers much like a slave ship, has been taken over by efficiency-minded corporate types. When they sack an employee, there's an uprising, and the building is unleashed from its moorings to sail across the (dry) ocean and take on the financial centers of the world, starting with an all-out attack on the large skyscraper housing The Very Big Corporation of America, complete with filing-cabinet cannons, ceiling-fan broadswords, and paper-spindle short-swords.

Life's questions are 'answered' in a series of outrageous vignettes, beginning with a staid London insurance company which transforms before our eyes into a pirate ship. Then there's the National Health doctors who try to claim a healthy liver from a still-living donor. The world's most voracious glutton brings the art of vomiting to new heights before his spectacular demise.