Capt. Jean-Luc Picard diverts the starship Enterprise from its scheduled trip to Cmdr. Riker and Counselor Troi's wedding to negotiate a peace treaty with the Romulans. Picard is shocked when Shinzon, the new Praetor of the Romulans, admits to being a clone of him. When the crew members discover a break-in on their computer, they are forced into a life-or-death battle to stop Shinzon's Warbird before it can destroy the Earth.