Marta Kristen
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Marta Kristen (born February 26, 1945) is a Norwegian-born American actress.

Kristen is best known for her role as Judy Robinson, one of Professor John and Maureen Robinson's daughters, in the television series Lost in Space (1965–1968). Marta played the part of the space family's eldest child, a mature "20-something woman" near the age group of the space pilot, played by Mark Goddard. Her mature role allowed adult form-fitting fashions and hairstyles, as shown in publicity photos of the TV series.

Kristen was born Birgit Annalisa Rusanen in Oslo, Norway, to a Finnish mother and a German soldier father who was killed during World War II. She spent her first years in an orphanage in Norway, and then was adopted in 1949 by an American couple from Detroit, Michigan, Harold Oliver Soderquist, and Bertha and renamed her Martha Annalise Soderquist. Her foster father was a professor of education at Wayne University, Detroit. Marta also has an adopted brother whom her foster parents adopted later.