Updated: October 11, 2025

Angela Margaret Cartwright ( Born September 9, 1952 ) is an English born American actress primarily known for her roles in movies and television. Cartwright is best known in movies as a child actress for her role as Brigitta von Trapp in the Academy Award winning film The Sound of Music ( 1965 ). On television, she played Linda Williams, the stepdaughter of Danny Williams ( Played by Danny Thomas ) in the 1950s TV series The Danny Thomas Show, and Penny Robinson, in the 1960s television series Lost in Space. Her older sister is actress Veronica Cartwright.