Star Trek The Next Generation - Unification

Captain Picard and the U.S.S. Enterprise crew are dispatched to investigate the apparent defection of Ambassador Spock to the Romulan Empire. Disguising themselves as Romulans, Picard and Data uncover Spock's true mission: to reunite Vulcan and Romulus, working with an underground movement. Their efforts are complicated by the reappearance of Commander Sela, who captures them as part of a sinister plot to conquer Vulcan. Now, they must escape and foil Sela's invasion plans.