From the cage to the big screen, the world's greatest Mixed Martial Arts Champions come together for the first time in a major motion picture. When an MMA world champion is lured into the illegal world of underground cage fighting by an elusive promoter, he quickly realizes that the only way out is to kill or to be killed.

Pride 8 was a mixed martial arts event held by the Pride Fighting Championships. It took place on November 21, 1999, at Ariake Coliseum in Tokyo, Japan.

UFC 20: Battle for the Gold was a mixed martial arts event held by the Ultimate Fighting Championship on May 7, 1999 at the Boutwell Auditorium in Birmingham, Alabama. The event was seen live on pay per view in the United States, and later released on home video.

UFC 24: First Defense was a mixed martial arts event held by the Ultimate Fighting Championship on March 10, 2000 at the Lake Charles Civic Center in Lake Charles, Louisiana.

UFC 27: Ultimate Bad Boyz was a mixed martial arts event held by the Ultimate Fighting Championship on September 22, 2000 at Lake Front Arena in New Orleans, Louisiana.

UFC 29: Defense of the Belts was a mixed martial arts event held by the Ultimate Fighting Championship on December 16, 2000 at Differ Ariake Arena in Tokyo, Japan.

UFC 30: Battle on the Boardwalk was a mixed martial arts event held by the Ultimate Fighting Championship at the Trump Taj Mahal in Atlantic City, New Jersey on February 23, 2001. UFC 30 was also the first UFC event since UFC 22 to see a home video release.

UFC 32: Showdown in the Meadowlands was a mixed martial arts event held by the Ultimate Fighting Championship at the Continental Airlines Arena in East Rutherford, New Jersey on June 29, 2001. The event was seen live on pay per view in the United States, and later released on home video.

UFC 33: Victory in Vegas was a mixed martial arts event held by the Ultimate Fighting Championship at the Mandalay Bay Events Center on the Las Vegas Strip in Las Vegas, Nevada on September 28, 2001. The event was seen live on pay per view in the United States, and later released on home video.