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Counselor Deanna Troi, played by Marina Sirtis, was a key character in "Star Trek: The Next Generation." As the ship's counselor, she provided emotional support and guidance to the crew, using her empathic abilities to sense and understand their feelings. Troi's compassionate and insightful nature made her an invaluable member of the Enterprise team, helping them navigate personal and interpersonal challenges while exploring the vastness of space.