Fact1: evil Brewmeister Smith is perfecting secret plan to take over world by placing mind-control drug in Elsinore beer, Fact2: brewery 's former owner has died under mysterious circumstances, Fact3: Pam has been given full control of Elsinore brewery, Fact4: Bob While find shuttered cafeteria containing old Galactic Border Patrol video game exploring massive brewery, Fact5: Jean Rosie LeRose has fallen under Smith 's control
Output: Two unemployed brothers, Bob and Doug McKenzie Rick Moranis and Dave Thomas, place a live mouse in a beer bottle in an attempt to blackmail the local beer store into giving them free Elsinore beer, but are told to take up the matter with management at the Elsinore brewery. The brothers are given jobs on the bottling line inspecting for mice in the bottles. Meanwhile, the evil Brewmeister Smith Max von Sydow is perfecting a secret plan to take over the world by placing a mindcontrol drug in Elsinore beer which, while rendering the consumer docile, also makes him or her attack others when certain musical tones are played. Smith tests this adulterated beer on patients of the neighbouring Royal Canadian Institute for the Mentally Insane, which is connected to the brewery by underground tunnels. Bob and Doug learn that the brewerys former owner, John Elsinore, has recently died under mysterious circumstances and his daughter Pam Lynne Griffin has been given full control of the Elsinore brewery. While exploring the massive brewery, they find a shuttered cafeteria containing an old Galactic Border Patrol video game which supernaturally reveals that Brewmeister Smith murdered John Elsinore and that Pams bumbling Uncle Claude Paul Dooley was deeply involved. Also, Bob recognizes a brewery employee as onetime hockey great Jean Rosie LeRose Angus MacInnes, who suffered a careerending nervous breakdown and has fallen under Smiths control. Eventually, Bob and Doug wander into the Brewmeisters operations room while he is away and Doug takes a floppy disk containing a video of John Elsinores murder thinking it is a new wave EP and not realizing the importance of its contents. Smith and Claude tranquilize the brothers and arrange to frame them for murder, concealing Pam and her fathers friend, Henry Green, in beer kegs in the back of their sabotaged van, and instruct the brothers to deliver the kegs to a party. Unable to stop, the brothers crash the van into Lake Ontario. All survive Pam with apparent memory loss, and the brothers are arrested. The brothers antics at their trial cause the judge to declare them insane and put them under Brewmeister Smiths care at the asylum. Rosie soon finds them and helps them escape, and they find and rescue Pam. Having figured out Brewmeisters plan, Rosie foments an uprising among the brainwashed mentalpatient test subjects. The brothers separate for the first time in their lives; Doug helps Rosie overpower Brewmeister Smith and the spirit of John Elsinore, possessing the brewerys electrical system, fatally strikes him with lightning. Meanwhile, Smith has locked Pam and Bob in a brewery tank and is filling it with beer; they escape this possible death when Bob consumes all the beer, expanding to a cartoonish size. John Elsinores ghost warns them that Smith has already shipped tainted beer to Oktoberfest and urges them to stop them. The police accompany the brothers back to their house to retrieve their dog, Hosehead, to invade the party. Enticed by promises of free beer and sausages, Hosehead leaps into the air and flies over the city like Superman. He crashes into the tent at the celebration and, mistaken for a skunk, frightens people away from the tainted beer. In the end, the McKenzie Brothers save the day and Pam and Rosie find in each other true love. As for the contaminated beer, Bob and Doug are allowed to haul away the lot, apparently to try to drink it all.