Milton Parker (Vincent Price), an eccentric game inventor, dies after losing a video game with his nurse (Carol Wayne). Parker's greedy and estranged relatives show up at his mansion for the reading of his will. Lawyer Charles Bernstein (Robert Morley) tells them the winner of a scavenger hunt will inherit the $200 million estate. The potential beneficiaries form five teams and get involved in various misadventures. The five teams consist of: Parker's widowed son-in-law Henry Motley and his four children. The servants: French cook Henri, valet Jenkins, limo driver Jackson and French maid Babbette. Dim-witted taxi driver Marvin Dummitz. Parker's widowed sister Mildred Carruthers, her attorney Stuart Sellsome, and her son Georgie. Nephews Kenny and Jeff Stevens, and Mildred's step-daughter Lisa. Each group is given a list containing clues to acquire 100 items with various point values ranging from 5 to 100 points. The items are to be acquired by any means necessary, with the exception of being purchased. They are to be placed in five different pens on the grounds of the estate. The winner of the scavenger hunt will be the person or team to acquire the most points by 5 p.m. that day. Chaos and carnage ensue, with scavengers returning occasionally to the Parker mansion to deposit items under the supervision of Bernstein and the scorekeeper, Cornfeld. Mildred, Stuart and Georgie's adventure has them trying to win a stuffed toy bear at a local carnival, trying to haul a heavy safe out of Stuart's office building, and stealing the false teeth of a Native American. Stuart gets roughed up by a motorcycle gang led by Scum (Meat Loaf) after attempting to steal a stuffed fox tail off one of the gang's motorcycles. Late in the game, the team steals items from the servants and the Stevens/Lisa teams. The servants' adventure has them trying to steal a toilet from a fancy hotel, partaking in a robbery at a convenience store to steal a cash register and getting locked in a univ