A profile of Billie Jean King, who won 39 Grand Slam tennis titles; helped form a precursor to the WTA Tour; founded the Women's Sports Foundation and Women's Sports magazine; cofounded World TeamTennis; and defeated Bobby Riggs at a much-ballyhooed "Battle of the Sexes" match in 1973. The documentary includes remarks from past and current tennis stars Margaret Court, Chris Evert, Maria Sharapova, and Serena and Venus Williams; Riggs' son Larry; Hillary Clinton; and Gloria Steinem.