Equinox (1970)

Equinox
Adventure, Horror
Due to their possession of an ancient mystic book, four friends are attacked by a demon while on a picnic and find themselves pitched into a world of evil that overlaps their own. The film was originally made in 1967 by Dennis Muren as The Equinox: Journey into the Supernatural. Jack Woods was hired to shoot additional footage and expand on Muren's work.
Starring
Edward Connell, Barbara Hewitt, Jack Woods, Frank Bonner, Robin Christopher, James Phillips, Fritz Leiber Jr., Patrick Burke, Sharon Gray, Louis Clayton
Directed By
Jack Woods, Dennis Muren