The crews of the Enterprise and the Excelsior must stop a plot to prevent a peace treaty between the Klingon Empire and the Federation.

Nearly 10 years have passed since Sarah Connor was targeted for termination by a cyborg from the future. Now her son, John, the future leader of the resistance, is the target for a newer, more deadly terminator. Once again, the resistance has managed to send a protector back to attempt to save John and his mother Sarah.