UFC 55: Fury was a mixed martial arts event held by the Ultimate Fighting Championship on October 7, 2005 at the Mohegan Sun Arena in Uncasville, Connecticut. The event was broadcast live on pay-per-view in the United States, and later released on DVD. This would be the last UFC to air live on a Friday until UFC 141, which aired on December 30, 2011.

Diego J. Sanchez (born December 31, 1981) is an American mixed martial artist (MMA) of Mexican descent, with a background in wrestling and Gaidojutsu, system of submission wrestling developed by his longtime trainer Greg Jackson. He currently fights as a welterweight with the Ultimate Fighting Championship (UFC). Sanchez is currently ranked as the #9 welterweight fighter in the world by MMAWeekly.

Sanchez was born in Albuquerque, New Mexico. He attended Del Norte High School, where he became a state champion wrestler.^{[citation needed]}

Diego Sanchez wrestled in New Mexico before starting training MMA while working for UPS. Sanchez eventually joined Jackson's Submission Fighting, still while working for UPS, managing the time between work and training. In 2002, he made his MMA debut for King of the Cage where he also later became a champion.

His UFC debut came when he was chosen as a participant on the first season of the reality show, The Ultimate Fighter. Presented as a young, focused middleweight who only had one goal, to become a UFC champion, he won a contract with the UFC after winning a fight against Kenny Florian, becoming the middleweight winner for the first season of the show. On the show, Sanchez was known for being the "odd-ball" of the group, practicing yoga at odd moments and trying to extract "energy" from a lightning storm, and was also a self-proclaimed "Zen master". Sanchez' last fight before his loss to Josh Koscheck was against Joe Riggs on December 13, 2006 at UFC Fight Night 7. Sanchez landed a right hook that knocked Riggs down, followed by a running knee that knocked Riggs out. Sanchez won at 1:45 of the first round, scoring the first UFC knockout of his career.

Anthony Pettis (born January 27, 1987) is an American mixed martial artist who competes in the lightweight division and is currently signed with the Ultimate Fighting Championship. A professional MMA competitor since 2007, Pettis has made a name for himself mainly fighting in his home state of Wisconsin. He is a former fighter for the World Extreme Cagefighting (WEC), where he was the last WEC Lightweight Champion before merging the promotion into the UFC.

Born to Eugene Pettis Jr. and Annette Garcia, Anthony Pettis grew up in the south side of Milwaukee, Wisconsin along with his older brother Ray Pettis and younger brother Sergio "Lil' Showtime" Pettis. Pettis is of Mexican and Puerto Rican ancestry, his grandfather Anglicized the family name from Perez to Pettis, to avoid discrimination. Pettis attended Dominican High School.

Anthony "Showtime" Pettis made his professional MMA debut in December 2007. He compiled an undefeated record of 8-0 in shows all based in Milwaukee, Wisconsin before debuting with the WEC. Pettis also has a professional kickboxing background.

Donald Frye (born November 23, 1965) is an American mixed martial artist, professional wrestler, and actor. Frye rose to fame fighting in early Ultimate Fighting Championship events, winning the UFC 8 and Ultimate Ultimate 96 tournaments. He holds notable victories over Ken Shamrock, Gary Goodridge (2x), Tank Abbott, and Gilbert Yvel.

Don Frye began wrestling at Buena High School in Sierra Vista, Arizona then in college (for Arizona State) in 1984, where he was trained by fellow future Ultimate Fighting Championship legend, then assistant wrestling coach, Dan Severn. In 1987, he won the freestyle and Greco-Roman events during an Olympic qualifier. A year later, he transferred to Oklahoma State, where he encountered another future UFC star amongst his teammates: Randy Couture.

On August 28, 1989, Frye made his professional boxing debut against Luis Mora in Phoenix, Arizona and won via first round knock out. This was to be his final pro boxing bout.

In 1995, Frye helped train his old friend Dan Severn for the Ultimate Ultimate 1995, accompanying Severn's entourage to Denver. Severn returned the favour in 1996, when he acted as Frye's manager for UFC 8. Fighting three times in one night, Frye dispatched all of his opponents in just under a minute total, winning the tournament with relative ease. At this event Frye set the record, since broken by Duane Ludwig, for fastest KO in the UFC at just 8 seconds. However, due to the controversial nature of the event, Frye was barred from both firefighting, his previous occupation in Sierra Vista, Arizona, and from training in the Buena High School gym he had used since his ASU days. Along with Marco Ruas, Frye is considered one of the original "cross trained" MMA competitors who had a background in multiple disciplines. Along with his collegiate wrestling experience, Frye holds a 2nd degree black belt in Judo and a professional boxing record.

Frank James Edgar (born October 16, 1981) is an American mixed martial artist, who competes as a lightweight in the Ultimate Fighting Championship and is a former UFC Lightweight Champion. His first career loss came against Gray Maynard in 2008, which marked the beginning of a noted rivalry. He later avenged the loss to Maynard with a KO victory in 2011. As of March 2012, he is ranked as the #2 lightweight in the world by Sherdog.com.

Born and raised in Toms River, New Jersey, Frankie Edgar wrestled at Toms River High School East, making it to the New Jersey state championship tournament on three occasions, placing second as a junior and fifth as a senior. Edgar is the oldest of 3 children, Edgar went on to compete in the NHSCA Senior Nationals and placed second before he finished high school. He continued wrestling at Clarion University of Pennsylvania, where he qualified for the nationals all four years there. Edgar is also an assistant coach for the Rutgers University wrestling team.

Edgar entered his first mixed martial arts fight with only a few weeks of training outside of his wrestling background. Edgar originally trained with Rob Guarino of Rhino Fight Team, but today he is part of the Gracie system under Ricardo Almeida in Hamilton, NJ. Since seventh grade Edgar has wrestled with Steve Rivera at Elite Wrestling NJ in Jackson, NJ. His boxing trainer is Mark Henry of Millstone, NJ.