The film revolves around a pornographer and several of his actors and actresses. One of the women mentions interest in setting up a scene where tampons are forcibly inserted into a girl's vagina as this kind of scene has 'never been done before.' From there the film delves into a blurry of oddball scenes consisting of penis guitar playing and women placing explosives in their lower regions.
During World War I, a German U-boat sinks a British ship and takes the survivors on board. After it takes a wrong turn, the submarine takes them to the unknown land of Caprona, where they find dinosaurs and neanderthals.
Monty Python and the Holy Grail loosely follows the legend of King Arthur. Arthur along with his squire, Patsy, recruits his Knights of the Round Table, including Sir Bedevere the Wise, Sir Lancelot the Brave, Sir Robin the Not-Quite-So-Brave-As-Sir-Lancelot and Sir Galahad the Pure.