Graham Chapman
John Cleese
Eric Idle
Terry Gilliam
Terry Jones
Michael Palin
Connie Booth
Carol Cleveland
Neil Innes
Bee Duffell
Graham Chapman as King Arthur/Voice of God/Middle Head/Hiccoughing Guard
John Cleese as Second Swallow-Savvy Guard/The Black Knight/Peasant 3/Sir Lancelot, the Brave/Taunting French Guard/Tim the Enchanter
Eric Idle as 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 as Patsy/Green Knight/Old Man from scene 24 (Bridgekeeper)/Sir Bors/Animator/Gorrilla Hand
Terry Jones as Dennis's Mother/Sir Bedevere/Left Head/Voice of Cartoon Scribe/Prince Herbert
Michael Palin as 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 as The Witch
Carol Cleveland as Zoot/Dingo
Neil Innes as First Monk/Singing Minstrel/Page Crushed by the Rabbit/Peasant #4
Bee Duffell as Old Crone
John Young as Dead Body/Historian Frank
Rita Davies as Historian's Wife
Avril Stewart as Dr. Piglet
Sally Kinghorn as Dr. Winston
Mark Zycon as Prisoner