June Kathleen Lockhart was an American actress, beginning a film career in the 1930s and 1940s in films such as A Christmas Carol and Meet Me in St. Louis. She appeared primarily in 1950s and 1960s television and with performances on stage and in film. She became most widely known for her work on two television series, Lassie and Lost in Space, in which she played mother roles. Lockhart also portrayed Dr. Janet Craig on the CBS television sitcom Petticoat Junction (1968–70). She was a two-time Emmy Award nominee and a Tony Award winner. With a career spanning nearly 90 years, Lockhart was one of the last surviving actors from the Golden Age of Hollywood.