Biography
June Lockhart (born June 25, 1925) is an American retired actress, beginning a film career in the 1930s and 1940s in such films as A Christmas Carol and Meet Me in St. Louis. She primarily acted in 1950s and 1960s television, and with performances on stage and in film. On two television series, Lassie and Lost in Space, she played mother roles. She also portrayed Dr. Janet Craig on the CBS television sitcom Petticoat Junction (1968–70). She is a two-time Emmy Award nominee and a Tony Award winner. With a career spanning nearly 90 years, she is one of the last surviving actors from the Golden Age of Hollywood. Her father was veteran actor Gene Lockhart. Description above from the Wikipedia article June Lockhart , licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

T-Men
Mary Genaro

Lost in Space
Principal Cartwright

Meet Me in St. Louis
Lucille Ballard

The Big Picture
Janet Kingsley

Sergeant York
Rosie York

Troll
Eunice St. Clair

A Christmas Carol
Belinda Cratchit (uncredited)

Out There
Donna

She-Wolf of London
Phyllis Allenby

The White Cliffs of Dover
Betsy Kenney at Age 18 (uncredited)