Reflecting her Scandinavian heritage, sheKristen adopted the more European-sounding "Marta" and used Marta Kristen as her stage name.<ref name=":2" /> She first appeared in a 1961 episode of ''[[Alfred Hitchcock Presents]]'', "Bang! You're Dead", alongside [[Bill Mumy|Billy Mumy]], who later co-starred with Kristen in ''Lost in Space''. HerIn first1963, successfulshe filmstarred rolewith was that of Lorelei in the 1965 movie ''[[BeachTony Blanket BingoDow]]''. She later starred in ''Lost"Four in Space'' and made numerous guest appearances on television shows. When her daughter was bornFeet in 1969, she began making television commercials and eventually appeared in more than 40. She also made the occasionalMorning," filman appearanceepisode in movies such asof ''[[TerminalThe IslandEleventh (film)|Terminal Island]]''Hour (1973),1962 ''[[OnceTV (1974 filmseries)|Once]]''The in 1974, appearing as a bare breasted 'Humanity', and the science-fiction film ''[[Battle Beyond theEleventh StarsHour]]''.<ref>{{cite (1980);web and had a cameo role in the 1998 movie ''[[Lost in Space (movie)|Losttitle=The inEleventh Space]]''.Hour: ShealsoFour appearedFeet in the [[A&EMorning Network|A&E]] [[biography]] ''[[Jonathan Harris]], Never Fear, Smith Is Here'' in 2002url=https://www.imdb.com/title/tt0569815/?ref_=tt_rvi_tt_t_3 Kristen also provided voice work for the 2009 animated theatrical short "[[The Bolt Who Screwed Christmas]]" which also included voice work from her ''Lost in Space'' co|access-starsdate=1 Harris,August Mumy, and [[Angela Cartwright]].2022}}</ref>
Kristen's first film role was in the 1963 Walt Disney production of ''[[Savage Sam (film)|Savage Sam]]''. She played the role of Lorelei in the 1965 movie ''[[Beach Blanket Bingo]]''.
Kristen starred in ''Lost in Space'' from its beginning in 1965 until its cancellation in 1968. Afterwards, she had a daughter, born in 1969, and appeared in more than forty television commercials as well as making numerous guest appearances on television shows. She also appeared in the [[A&E Network|A&E]] [[biography]] ''[[Jonathan Harris]], Never Fear, Smith Is Here'' in 2002.
She also made the occasional film appearance in movies such as ''[[Terminal Island (film)|Terminal Island]]'' (1973), ''[[Once (1974 film)|Once]]'' in 1974, appearing as a bare breasted 'Humanity', and the science-fiction film ''[[Battle Beyond the Stars]]'' (1980); and had a cameo role in the 1998 movie ''[[Lost in Space (movie)|Lost in Space]]''. Kristen also provided voice work for the 2009 animated theatrical short "[[The Bolt Who Screwed Christmas]]" which also included voice work from her ''Lost in Space'' co-stars Harris, Mumy, and [[Angela Cartwright]].
