Equinox

Four friends, David, Vicki, Jim and Susan, head out into the woods to visit David's professor, Dr. Waterman. They find Waterman'home destroyed, the professor missing, and a mysterious book. It soon becomes apparent that in meddling with the book, Waterman accidentally opened a portal to another, hellish dimension, and now the demon Asmodeus (posing as a park ranger) wants to acquire the powerful book. The four friends must fight against a variety of ghoulish monsters sent after them by Asmodeus, and eventually Asmodeus himself, in order to make it back to civilization alive.

Often considered one of the best-worst movies of all time, Equinox was a student film made by a young Dennis Muren which producer Jack Woods picked up for cinematic distribution, casting himself as Asmodeus and shooting some new scenes. On the one hand, this seems like a strange movie for Criterion to release, especially in a two-disc set, however despite its ineptitude it features some charming stop-motion animation for the various monsters (and some impressive forced-perspective shots to turn an ordinary stuntman into a blue-skinned giant) and it's also certainly worthy of being preserved if only because Dennis Muren and his friends had such a piddly budget to work with that it' a miracle they even had a completed (albeit rough) film, even before Jack Woods came along.