Scientistsatasecretundergroundcomplexhavefoundawaytotraveltoanotherdimension.Threedimension-travellersarethefirsttogothroughthegate-butaresoonattackedbysomethingthatinterruptsthecommunicationwithEarth.Thishorriblesomethingusesthegatetotravelbacktotheundergroundcomplex.Mostofthestaffareevacuated,exceptfourheavily-armedmilitariesandDr.CasserlyandDr.Summerfieldwhojustcan’tstandeachother...