| Graham Chapman |
King Arthur / Voice of God / Middle Head / Hiccoughing Guard |
| John Cleese |
Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Lancelot, 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 / Sir Bors / Animator / Gorrilla Hand |
| Terry Jones |
Dennis's Mother / Sir Bedevere / Left Head / Voice of Cartoon Scribe / Prince Herbert |
| 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 |
| Neil Innes |
First Monk / Singing Minstrel / Page Crushed by the Rabbit / Peasant #4 |
| Bee Duffell |
Old Crone |
| John Young |
The Dead Body That Claims It Isn't / Historian |
King Arthur and his knights embark on a low-budget search for the Grail, encountering many very silly obstacles.