A ribbon of energy in space, in which time doesn't seem to pass. James T. Kirk, Captain of the U.S.S. Enterprise, NCC-1701-A, disappears into this phenomenon during the christening of the U.S.S. Enterprise, NCC-1701-B. Captain Spock, following his death in the alternate timeline he entered after being lost in a black hole while trying to save the Romulan home world, wakes up in a strange world called Nexus. He learns that his captain had been here, and sets off to find him.