아더왕은 영국 전역을 돌아다니며 자신들을 보좌할 기사들을 모집한다. 결국 용맹한 기사들 랑셀럿, 로빈, 베드베어 그리고 갈라드를 합류시킨 아더왕은 신의 계시에 따라 잃어버린 성배를 찾으러간다. 각각 흩어져 성배의 수색을 하지만 용맹한만큼 멍청하기도한 기사들은 성배를 찾기는 커녕 소동만을 일으키고 만다.
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Graham Chapman
King Arthur / Voice of God / Middle Head / Hiccoughing Guard
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John Cleese
Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter
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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
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Terry Gilliam
Patsy / Green Knight / Old Man from Scene 24 (Bridgekeeper) / Sir Bors / Animator / Gorilla Hand
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Terry Jones
Dennis's Mother / Sir Bedevere / Left Head / Prince Herbert / Voice of Cartoon Scribe
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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!
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Connie Booth
The Witch
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Carol Cleveland
Zoot / Dingo
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Neil Innes
First Monk / Singing Minstrel / Page Crushed by the Rabbit / Peasant #4
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John Young
Dead Body / Historian Frank
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Rita Davies
Historian's Wife
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Sandy Johnson
Knight of Ni / Villager at Witch Burning / Musician at Wedding / Monk / Knight in Battle
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Fiona Gordon
Girl in Castle Anthrax
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Julian Doyle
Police Sergeant (uncredited)
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Terry Jones
Themselves (uncredited)
