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In page Barbara Darrow:

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Darrow's work as a model led to her receiving offers of film contracts. On August 31, 1950, a judge approved her seven-year contract with RKO Studios.[1] She made mostly B-movies in the 1950s, including The Monster That Challenged The World and Queen of Outer Space. She replaced Marla English opposite Spencer Tracy in The Mountain, after English had an adverse reaction to a smallpox vaccine.[2] By 1955, she was one of only three actors under contract to RKO.[citation needed]