Maureen O'Brien

Maureen O'Brien is a British actress and novelist. She is perhaps most famous for her role as Vicki, the companion to William Hartnell's First Doctor in Doctor Who, becoming the first change to the or... Maureen O'Brien is a British actress and novelist. She is perhaps most famous for her role as Vicki, the companion to William Hartnell's First Doctor in Doctor Who, becoming the first change to the original cast line up in 1965. She also played Elizabeth Straker in the second series of the long running BBC drama Casualty in 1987.