Lifeforce

An international team of astronauts, led by Colonel Tom Carlson, is sent into space on a mission to explore Halley's Comet. The team finds a ship hidden in the coma of the comet. Unable to contact Earth because of the electromagnetic interference, Colonel Carlson decides to explore the ship. Once inside, they find the remains of long dead bat creatures along with three glass coffins containing what appear to be humans. Colonel Carlson decides to take the three coffins back to earth along with one of the bat creatures. On the ride back to Earth, the crew discovers what the "humans" really are.