Xtro 2: The Second Encounter1990

Horror Vault's take

Deep beneath the surface, a classified government research facility becomes a sealed death trap when an experiment with dimensional portals goes catastrophically wrong. An alien entity crosses over and begins hunting the personnel trapped inside, with the facility's own AI lockdown cutting off any hope of easy escape. It's a lean, mean creature-feature that pits a small cast of scientists and soldiers against something utterly beyond their understanding. Fans of late-80s and early-90s sci-fi horror will find a familiar but effectively claustrophobic setup here.

Content: Creature Violence, Slime And Gross-Out Practical Effects, Mild Gore