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.

“Monty Python and the Holy Grail,” which turns 40 this year, has been watched countless times, but there’s some good news for fans. You haven’t seen everything just yet.

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.