The plot revolves around an elite group of soldiers (Gooding, Manning, Jason London, Franky G, Zack Ward, Stephanie Jacobson and Brandon Fobbs) sent on a covert mission by a government agent (Cruz) to retrieve a missing scientist (Perlman) from an underground lab.

They encounter a priest (Rollins) who tells them that an "ancient evil" has been released, causing their greatest fears to come to life. Their former leader (Winstone) plays a pivotal role in uncovering what is actually taking place at the facility. Bill Moseley and Sarah Ann Morris play members of the compromised research team.