Xtro II: The Second Encounter

In a clandestine underground laboratory, scientists successfully create a gateway to an alternate dimension. When the initial explorers are attacked, a terrifying alien life form uses the portal to invade the facility. With most personnel evacuated, a small team of four soldiers and two bickering scientists are left behind. They must overcome their differences and fight for survival against the monstrous creature with an appetite for human flesh before the entire base self-destructs.