Le roi Arthur recrute ses chevaliers de la Table ronde et doit surmonter des obstacles absurdes lors de sa quête dans un monde médiéval loufoque.

Distribution

• Graham Chapman — King Arthur / Voice of God / Middle Head / Hiccoughing Guard
• John Cleese — Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter
• Eric Idle — Dead Collector / Peasant 1 / Sir Robin the Not-Quite-So-Brave-as-Sir Launcelot / First Swamp Castle Guard / Concorde / Roger the Shrubber / Brother Maynard
• Terry Gilliam — Patsy / Green Knight / Old Man from Scene 24 (Bridgekeeper) / Sir Bors / Animator / Gorilla Hand
• Terry Jones — Dennis's Mother / Sir Bedevere / Left Head / Prince Herbert / Voice of Cartoon Scribe
• Michael Palin — First Swallow-Savvy Guard / Dennis / Peasant 2 / Right Head / Sir Galahad the Pure / Narrator / King of Swamp Castle / Brother Maynard's Brother / Leader of The Knights Who Say NI!
• Connie Booth — The Witch
• Carol Cleveland — Zoot / Dingo