UFC 21: Return of the Champions was a mixed martial arts event held by the Ultimate Fighting Championship on July 16, 1999 at the Five Seasons Events Center in Cedar Rapids, Iowa. The event was seen live on pay per view in the United States, and later released on home video.

UFC 18: The Road to the Heavyweight Title was a mixed martial arts event held by the Ultimate Fighting Championship on January 8, 1999 in New Orleans, Louisiana. The event was seen live on pay per view in the United States, and later released on home video.

UFC 23: Ultimate Japan 2 was a mixed martial arts event held by the Ultimate Fighting Championship on November 19, 1999 at Tokyo Bay NK Hall in Tokyo, Japan.

UFC Brazil: Ultimate Brazil (also known as UFC 17.5) was a mixed martial arts event held by the Ultimate Fighting Championship in São Paulo, Brazil on October 16th, 1998. The event was seen on pay per view in the United States and Brazil, and was later released on home video.

NJPW The Spiral was a Pay Per View event produced by New Japan Pro Wrestling, which took place on October 14, 2002, at the Tokyo Dome in Tokyo, Japan.