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From Wikipedia:
King Arthur is recruiting his Knights of the Round Table throughout England.
He is frustrated at every turn by anarcho-syndicalist peasants, a Black Knight
that refuses to give up despite losing both his arms and legs, and guards that
are more concerned with the flight patterns of swallows than their lord and
master. Finally he meets up with Sir Bedevere the Wise, Sir Lancelot the
Brave, Sir Galahad the Pure (also called "the Chaste"), Sir Robin the
Not-Quite-So-Brave-As-Sir-Lancelot, and "the aptly named Sir
Not-Appearing-In-This-Film", and declares them the Knights of the Round Table.
They are given a quest by God to find the Holy Grail.
After they split up, Sir Robin encounters a Three-Headed Giant, Galahad runs
across the perils of Castle Anthrax, Sir Lancelot massacres a wedding at Swamp
Castle, and Arthur and Bedevere encounter the dreaded Knights who say Ni. They
each overcome their individual perils and reunite to face a bleak and terrible
winter. Surviving the winter by eating Sir Robin's minstrels, they venture
further to a pyromaniac enchanter named “Tim”, who takes them to a cave
guarded by a killer rabbit.
After killing the vicious Rabbit of Caerbannog with the Holy Hand Grenade of
Antioch, the knights face The Legendary Black Beast of Aaargh, and cross the
Bridge of Death that is guarded by “the old man from Scene 24”. Arthur and
Bedevere survive to arrive at Castle Aaargh, and face the French Taunter once
more. The film ends abruptly when a group of police from the 1970s interrupt
the climactic battle scene to arrest Bedevere and King Arthur for the murder
of Frank, the “famous historian”.