Fifty years since the Summer Olympic in Mexico City, NBC brought viewers back to that tumultuous and politically-charged year with a 90-minute documentary called “1968.” Four-time Olympic gold medalist and 23-time Grand Slam singles champion Serena Williams narrated the film, which made its broadcast television debut Sunday, Feb. 25. Watch this 2-minute trailer for the show, and look for the full documentary—which focuses largely on the U.S. track and field team—to be released online soon.

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