Long before the Federation, a powerful force invaded our galaxy and almost destroyed it...a force that began with possession and madness, and ended in murder! A Starfleet research expedition to the farthest reaches of the galaxy has unearthed that force once again...and brought its silent evil back to the planet Vulcan. Now Spock must defeat the demons that threatens his friends and family, or the USS Enterprise will become the instrument of the galaxy's destruction!