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Brilliantly constructed in semi-documentary fashion, Katherine is the story of how a young upper-middle-class girl gradually radicalizes into a violence-prone revolutionary. The story is related in flashbacks sparked by "interviews" with Katherine (Sissy Spacek), her troubled parents (Art Carney, Jane Wyatt) and her radical mentor (Henry Winkler). After the idealism is knocked out of her by her horrendous experiences in the American South and in South America, Katherine matriculates into one of the most militant members of a Weatherman-like student organization. The film's tragic ending is both startling and inevitable. Originally telecast in a two-hour slot on October 5, 1975, Katherine was later syndicated in a 78-minute version.