Dogfighting is a blood sport utilized for entertainment and may also create a revenue stream from stud fees, admission fees, and gambling. This BBC Documentary shows an Undercover Investigation into the secret and dangerous world of international dogfighting. For a year and a half, a BBC undercover team operated alongside dogfighting gangs in the UK and Europe, capturing on camera the savagery of organized fights. The film also reveals how American pitbull terriers – a banned breed created to be the ultimate canine gladiator – have been sold by the gangs into inner city Britain.