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Angela Margaret Cartwright (born September 9, 1952) is an English-born American actress primarily known for her roles in movies and television. On television, she played Linda Williams, the stepdaughter of Danny Williams (played by Danny Thomas) in the long-running TV series The Danny Thomas Show, and Penny Robinson in the 1960s television series Lost in Space. Cartwright's most famous movie role was the part of Brigitta von Trapp in the film The Sound of Music (1965). Wikipedia