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Deanna Troi appearing as Rakal
Major Rakal was an agent in the Romulan Tal Shiar.
In 2369, she was murdered by members of the Romulan underground movement so that Starfleet officer Deanna Troi could be surgically altered to take her identity for a mission involving the defection of Vice-Proconsul M'ret and his aides to the Federation. (TNG: "Face Of The Enemy")
This character was only mentioned in dialogue.