Xtro 2: The Second Encounter

“Part Alien. Part Predator. All Terror.”

An alien entity has come through a dimensional portal into a government research base buried underground, and the facility's A.I.-controlled computer responds by sealing everyone inside. Dr. Ron Shepherd (Jan-Michael Vincent) and Dr. Alex Summerfield (Paul Koslo) work the experiment, and the staff are cut off from any way out. Harry Bromley Davenport makes the lockdown the real danger, a machine that protects the building by trapping the people inside it.