Terry's mother worked in the film industry for many years. She always wanted him to marry an actress.

Her mature role allowed adult form-fitting fashions and hairstyles as shown in publicity photos of the TV series. On a trip to Finland in 1969 Marta Kristen located her birth mother Helmi Rusanen and an older sister whom Marta Kristen had never met; and in 1997 Marta Kristen discovered a brother residing in Australia. She moved to Los Angeles California with her family in 1959 and is a graduate of Santa Monica High School.

The naturally blonde-haired 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). Her mature role allowed adult form-fitting fashions and hairstyles as shown in publicity photos of the TV series. Marta Kristen (born February 26 1945) is an American actress.