|Birthdate:||February 26, 1945|
Marta Kristen (born February 26, 1945) is a Norwegian-born American actress. Kristen is best known for her role as Judy Robinson, the daughter of Professor John and Maureen Robinson, 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.