Co-directors Henry Alex Rubin and Dana Adam Shapiro lift the lid on the ferociously competitive sport of quadriplegic rugby in this revealing documentary. The film is structured around the intense rivalry between the USA and Canadian teams - beginning at the 2002 World Championships and climaxing at the 2004 Paralympics in Athens - and focuses on the bad blood between intimidating US star player Mark Zupan and American hero-turned-Canadian-coach Joe Soares. Glimpses into both teams' lives, both in and out of the gladiatorial wheelchair arena, are combined with candid interviews about their disabilities and particularly the impact on their sex lives. Two other themes emerge: the gradual healing of Zupan's relationship with best friend Chris Igoe, who was responsible for his accident; and how the sport could offer a lifeline to recently injured motocross rider Keith Cavill. Both the vicious Mad Max-style matches and the background stories of human courage and personal triumph are presented with a refreshing absence of pity that is inspiring, thrilling and humbling.