The Thaw

When a team of ecology students assisting an environmentalist (Val Kilmer) in the Arctic uncovers the frozen body of a woolly mammoth, they unwittingly release a parasite in need of a new host -- and, in the process, unleash a prehistoric terror. The ante is significantly upped when the parasite takes refuge inside the students' warm-blooded bodies and leads the group to a heart-wrenching decision.