Framed through the world-famous Wimbledon tournament, this documentary revisits a golden age of tennis during the 1970s and 1980s that changed the sport for ever. It begins in 1975 as two tennis greats - Billie Jean King and Arthur Ashe - aim to win Wimbledon titles but also, in their own ways, to change the world for the better. Back in the late 1960s, as the women's liberation movement became headline news, King took up the gauntlet for women in sport, spearheading the drive for equal prize money and equal treatment