<P> 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 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 . </P>
<P> 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 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 . </P>
who played penny robinson in lost in space
who played penny robinson in lost in space
Angela Margaret Cartwright
Angela Margaret Cartwright