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Marina Sirtis appeared in four Star Trek feature films: Star Trek VI: The Undiscovered Country (1991), Star Trek Generations (1994), Star Trek: First Contact (1996), and Star Trek: Insurrection (1998). She portrayed the character of Counselor Deanna Troi, a half-human, half-Betazoid who serves as the ship's counselor on the USS Enterprise-D and USS Enterprise-E.