From Beyond

Obsessive scientist Dr. Pretorius and his assistant Crawford Tillinghast have invented 'The Resonator', a device intended to stimulate the brain's pineal gland and expand the powers of the mind. The machine gives them more than they bargained for however when a parallel universe inhabited by slimy creatures ready to prey on humans reveals itself. Pretorius meets a sticky end, returns as a grotesque, deformed being and all manner of depravity ensues. (Second Sight)