Star Trek: The Next Generation (1987)

S7E12 The Pegasus

Stardate: 47457.1. Riker embarks on a secretive operation to locate the lost starship he previously served on, only to discover that the mission conceals a threat capable of unraveling the fragile peace between the Federation and the Romulans. As he delves deeper, Riker must navigate the dangers of both space and diplomacy to prevent an interstellar conflict.