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Heroes of the Flames is a 1931 American Universal movie serial. Although once considered to be lost, it has survived and a print has been preserved by Universal as of 2016. It stars Tim McCoy (in a break from his usual cowboy roles) as a firefighter who is developing a new kind of flame retardant, but his work is constantly being disrupted by a rival named Don Mitchell (Gayne Whitman) who wants the formula for himself as well as the leading lady, played by Marion Shockley. imdb.com