From Beyond

A group of scientists have developed the Resonator, a machine which allows whoever is within range to see beyond normal perceptible reality. But when the experiment succeeds, they are immediately attacked by terrible life forms.
The Resonator, a powerful machine that can control the sixth sense, has killed its creator and sent his associate into an insane asylum. When a beautiful psychiatrist becomes determined to continue the experiment, she unwittingly opens the door to a hostile parallel universe.