Celebrate the 40th anniversary of "Monty Python and the Holy Grail" with this 14-minute video of previously unseen animations by Terry Gilliam, who also explains the inspiration behind his work.

The video has surfaced ahead of the theatrical re-release of the Monty Python and the Holy Grail, 40 years after it originally came out. It is also being released on Blu-ray and DVD on October 27.