^I actually watched that damn thing back in the late 1970s, and it took a week for me to recover from the coma it induced. A friend gave it to me on VHS for my last birthday--I keep it sealed in a stone crypt at the bottom of the Chesapeake Bay, where it is guarded by trained sharks, lest someone try to unseal the tomb and allow the evil to escape.
It is, indeed, strong with the Dark Side of the Force.