Equinox
A friend of mine showed me this one as a cult classic that was the creation of many of the special effects team that went on to work on Star Wars.
Portions of the plot also bear several uncanny resemblences to The Evil Dead.
But this film isn't anywhere near as entertaining as either of those two. The affects might be more amusing than what you might normally see on MST3K, but otherwise the plot and acting would qualify this for a good candidate for that show.
They shot it over several years so the actors ages and hair styles keep changing. And then I was told that a producer was hired to fix the story but ended up just making it more convoluted.
It's on the Criterion Collection though as a double disc set, so there are plenty of extras if you want to spend more time analyzing this movie than it's probably worth.
Rating: 2/10