Morgan Brittany (born Suzanne Cupito, December 5, 1951) is an American actress, best known for her role as Katherine Wentworth, the scheming younger half-sister of Pamela Ewing and Cliff Barnes, on the prime time soap opera Dallas.
Cupito began her career as a child actress at age five in a 1957 episode of the CBS television network anthology series Playhouse 90. In January 1960, she displayed her talent as a ballet dancer on The Dinah Shore Chevy Show. Three months later, she followed that up with her first of three Twilight Zone episodes, uncredited as a little girl in "Nightmare as a Child", Sissy Johnson in the fourth-season episode, "Valley of the Shadow", and Susan in the fifth-season episode, "Caesar and Me". She appeared in an episode of My Three Sons as Melinda, the daughter of a busy divorced woman. In 1960, she also appeared in the third season of Sea Hunt, as the girl trapped in a mine cave-in in the episode "Cindy".