Morgan Brittany (born Suzanne Cupito, December 5, 1951) is an American film and television actress. She is perhaps best known for her role in the 1980s primetime soap opera Dallas, as Katherine Wentworth, the scheming younger half-sister of Pamela Ewing and Cliff Barnes. Suzanne Cupito began her career as a child in a 1960 episode of Twilight Zone entitled 'Nightmare as a Child', as the little girl at the end of the episode. (She later played Sissy Johnson in the fourth season episode, 'Valley of the Shadow', and Susan in the fifth season episode, 'Caesar and Me'). She appeared in a 1960 episode of Lloyd Bridges's Sea Hunt, and in the 1962 film, Gypsy, as Baby June. She appears uncredited in the birthday party scene of the 1963 film The Birds.
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