Star Trek: The Next Generation S04 E08 Future Imperfect

"New stars. New stories. New worlds to explore."

Stardate: 44286.5. Riker awakens one morning to discover he is suddenly 16 years in the future as the captain of the Enterprise, and negotiating a peace treaty with the Romulans with no recollection of how he arrived at that point in time, or of any recent events.