High Quality Content by WIKIPEDIA articles! The Killer Rabbit of Caerbannog is a fictional beast in the movie Monty Python and the Holy Grail. It is the antagonist in a major setpiece battle, and makes a similar appearance in Spamalot, a musical inspired by the movie. The iconic status of this skit was important in establishing the viability of the musical. In the film, King Arthur's Knights of the Round Table are led to the Cave of Caerbannog by Tim the Enchanter, and find that they must face down both the Rabbit and the Black Beast. The Cave of Caerbannog ("caer bannog" being Welsh for "turreted castle") is the home of the Legendary Black Beast of Aaaaarrrrrggggghhhhh. This is guarded by a monster which is initially unknown.