space marines with female heroine/alien monster that secretes an acidic liquid/numerous close-up shots of the monster's mouth wide open and dripping slime/planetary colony owned by a corporation has ceased communication/planet has a nuclear reactor set to explode/deep space travel hibernation/drop ship scene/motion sensors/corporate weasel along on the mission double-crosses them/finale has the female heroine go it alone into the monster's lair to rescue another female