Marta Kristen was born Birgit Annalisa Rusanen, on February 26, 1945, in Oslo, Norway, to a Finnish mother and a German soldier who was killed towards the end of World War II in Europe. Marta was only two months old when she was left in an orphanage. In 1949, Dr. and Mrs. Harold Soderquist of Detroit, Michigan adopted her, and brought her to America; she was renamed Martha Soderquist.

In 1959, the family moved to L.A. and she attended Santa Monica High School for a year; she later graduated from Hollywood Professional School. Producer/director James B. Harris discovered the pretty, petite aspiring actress; he arranged for her to get an agent, and she was quickly booked for TV programs, such as Alfred Hitchcock Presents and The Loretta Young Show (aka "The New Loretta Young Show"). In 1963, Marta met a graduate student and, 6 months later, they got married. Her career took off and she made a splash as the mermaid "Lorelei" in Beach Blanket Bingo. She would be best-known and remembered, however, for her signature role of "Judy Robinson" in Lost in Space.

Marta is also known for her work in Battle Beyond the Stars, Murphy Brown, Fame and Trapper John.

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