Star Trek: The Next Generation (1987)

S6E3 Man of the People

Stardate 46071.6. Deanna Troi finds herself drawn to a charismatic alien ambassador. However, her infatuation takes a dark turn as she begins to age at an alarming rate, leading to increasingly violent behavior. As the situation escalates, the crew must uncover the mysterious connection between her rapid aging and the ambassador before it's too late, putting their skills and relationships to the test.