<P> The group travels to the Bridge of Death, where each knight must answer three questions from the bridge - keeper before proceeding . Lancelot easily answers his questions and crosses the bridge . Robin is confounded by a difficult question, while Galahad gives a wrong answer to an easy one; both are hurled into the Gorge of Eternal Peril . Arthur responds to the bridge - keeper's question with a question, and the bridge - keeper is thrown into the chasm for not knowing the answer . </P> <P> Lancelot, separated from Arthur and Bedevere, is arrested by the police who are investigating the historian's murder . Arthur and Bedevere travel to the Castle Aarrgh, which they find occupied by the French forces that taunted them earlier . They amass a large army and prepare to storm the castle, but just as they begin to charge, the modern police arrive . Arthur and Bedevere are arrested, and one of the officers covers the lens with his hand, as the film appears to break in the projector . </P> <Table> <Tr> <Th> Actor </Th> <Th> Main role </Th> <Th> Other roles (in order of appearance) </Th> </Tr> <Tr> <Th> Chapman, Graham Graham Chapman </Th> <Td> Arthur, King of the Britons </Td> <Td> Voice of God / Middle Head of Three - Headed Knight / Hiccuping Guard at Swamp Castle </Td> </Tr> <Tr> <Th> Cleese, John John Cleese </Th> <Td> Sir Lancelot the Brave </Td> <Td> Swallow - Savvy Guard #2 / Man with "Dead" Body / Black Knight / Witch - hunting Villager #3 / Singing Camelot Knight #4 / French Taunter / Tim the Enchanter </Td> </Tr> <Tr> <Th> Gilliam, Terry Terry Gilliam </Th> <Td> Patsy, Arthur's Servant </Td> <Td> Green Knight / Singing Camelot Knight #3 / Gorilla Hand / Old Man in Scene 24 (Soothsaying Bridgekeeper) / Sir Bors / Weak - Hearted Animator (Himself) </Td> </Tr> <Tr> <Th> Idle, Eric Eric Idle </Th> <Td> Sir Robin the Not - Quite - So - Brave - as - Sir - Lancelot </Td> <Td> Dead Collector / Witch - Hunting Villager #1 / Singing Camelot Knight #2 / Confused Guard at Swamp Castle / Concorde (Lancelot's squire) / Roger the Shrubber / Brother Maynard </Td> </Tr> <Tr> <Th> Jones, Terry Terry Jones </Th> <Td> Sir Bedevere the Wise </Td> <Td> Dennis' Mother / French Knight / Left Head of Three - Headed Knight / Voice of Cartoon Scribe / Prince Herbert </Td> </Tr> <Tr> <Th> Palin, Michael Michael Palin </Th> <Td> Sir Galahad the Pure </Td> <Td> Swallow - Savvy Guard #1 / Dennis / Witch - Hunting Villager #2 / Narrator / Singing Camelot Knight #5 / French Knight / Right Head of Three - Headed Knight / Leader of the Knights Who Say Ni / King of Swamp Castle / Guest at Swamp Castle / Monk (Maynard's Assistant) </Td> </Tr> <Tr> <Th> Booth, Connie Connie Booth </Th> <Td> Miss Islington, the Witch </Td> <Td> </Td> </Tr> <Tr> <Th> Cleveland, Carol Carol Cleveland </Th> <Td> Zoot </Td> <Td> Dingo (Zoot's identical twin sister) </Td> </Tr> <Tr> <Th> Innes, Neil Neil Innes </Th> <Td> Leader of Robin's Minstrels </Td> <Td> Leader of Chanting Monks / Witch - Hunting Villager #4 / Singing Camelot Knight #1 / Page Crushed by Wooden Rabbit / French Knight </Td> </Tr> <Tr> <Th> Duffell, Bee Bee Duffell </Th> <Td> Old Crone </Td> <Td> </Td> </Tr> <Tr> <Th> Young, John John Young </Th> <Td> Frank, the Historian </Td> <Td> "Dead" body </Td> </Tr> <Tr> <Th> Davies, Rita Rita Davies </Th> <Td> Frank's Wife </Td> <Td> </Td> </Tr> <Tr> <Th> Stewart, Avril Avril Stewart </Th> <Td> Dr. Piglet </Td> <Td> </Td> </Tr> <Tr> <Th> Kinghorn, Sally Sally Kinghorn </Th> <Td> Dr. Winston </Td> <Td> </Td> </Tr> <Tr> <Th> Zycon, Mark Mark Zycon </Th> <Td> Sir Robin (stand - in) </Td> <Td> Prisoner in Camelot Dungeon </Td> </Tr> <Tr> <Th> Johnson, Sandy Sandy Johnson </Th> <Td> Knight Who Says Ni </Td> <Td> Witch - Hunting Villager / Musician at Swamp Castle / Monk / Knight in Final Battle </Td> </Tr> <Tr> <Th> Doyle, Julian Julian Doyle </Th> <Td> Police Sergeant who stops the film </Td> <Td> </Td> </Tr> <Tr> <Th> Burton! Richard Burton </Th> <Td> One - legged Black Knight (Stand - in) </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Actor </Th> <Th> Main role </Th> <Th> Other roles (in order of appearance) </Th> </Tr>

Who played sir robin in the holy grail