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The Defector

A Romulan scoutship, with a Romulan Warbird in pursuit, hails the Enterprise and requests asylum. After the Enterprise easily chases off the Warbird, they beam aboard the occupant of the scoutship, Setal, who has information about a new Romulan offensive. The Enterprise crew, skeptical about the defector's claims and motives and attempting to get at the truth, travels to Nelvana 3 where there is supposed to be a Romulan base at which a large Romulan fleet will gather to launch an offensive against the Federation.

The Next Generation, seizoen 3