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Kirstie Alley

Famous for: playing Rebecca Howe on "Cheers" and, later, being a prominent Scientologist. Her character: The half-Vulcan, half-Romulan star fleet cadet Saavik in "Star Trek II: The Wrath of Khan." She was mentored by Spock and served as navigator for Adm. Kirk. She also helped Spock through the... Genaro Molina / Los Angeles Times