UFC 45: Revolution was a mixed martial arts event held by the Ultimate Fighting Championship on 21 November 2003, at the Mohegan Sun Casino in Uncasville, Connecticut. The event was broadcast live on pay-per-view in the United States, and later released on DVD.

This event marked the 10th anniversary of the UFC and to celebrate the anniversary the UFC inaugurated its Hall of Fame, with Royce Gracie and Ken Shamrock as the first inductees. UFC President Dana White said; "We feel that no two individuals are more deserving than Royce and Ken to be the charter members. Their contributions to our sport, both inside and outside the Octagon, may never be equaled.”

In addition, ten fighters were chosen by fans to receive a Viewer's Choice Award during the event; they were Royce Gracie, Ken Shamrock, Randy Couture, Tank Abbott, Mark Coleman, Pat Miletich, Marco Ruas, Dan Severn, Don Frye and Oleg Taktarov.

Frank Mir was attached to fight Tim Sylvia in a UFC Heavyweight Championship fight, then Wes Sims in a UFC 43 rematch, and finally, UFC 1 & 2 veteran Patrick Smith at this event, but each fighter was pulled from the card, resulting in Mir's withdrawal as well.

Dewey Franklin Trigg III (born May 7, 1972) is an American mixed martial artist, color commentator, pro wrestler and co-host of MMAWeekly radio show and TAGG radio show. As a fighter, Trigg is a veteran of the UFC, Pride Fighting Championships, Rumble on the Rock, Icon Sport, BAMMA, World Fighting Alliance, and has even made a few professional wrestling appearances in Total Nonstop Action Wrestling.

Born in Kendall, New York, a small town outside of Rochester, New York, Trigg was one of seven children raised by an African-American father and a Italian-American mother, Trigg's early years were not always easy. Growing up in a home with seven brothers, money was tight. That's how Trigg discovered grappling. Naturally, with so many boys in the household, sibling rivalry was rampant, particularly when it came to athletics. Excelling in sports was a highly revered goal, and Trigg's natural athleticism made people take notice.

Trigg developed an early interest in martial arts. However, the sport’s requisite discipline and sacrifices were intense on the grade schooler, and he lost interest until he discovered he had a gift for wrestling at the age of 12. It was then that he resumed his martial arts studies seriously.^{[citation needed]}

Mac Danzig (born January 2, 1980) is an American mixed martial artist, who competes as a lightweight in the Ultimate Fighting Championship.

Danzig, of German and Scots-Irish descent, grew up in the greater Pittsburgh area before moving to Los Angeles to pursue his career.

In the past, Danzig was known for his association with R1 fight team (formerly RAW) and had been a student of Iowa wrestling standout Rico Chiapparelli and MMA fighter Frank Trigg. Since then he trained boxing extensively at both the Wild Card gym in Hollywood, California under Freddie Roach assistant Justin Fortune, and more recently under Gil Martinez in Las Vegas, Nevada. Danzig credits Martinez as his only current boxing coach.

While Danzig is known as an impressive grappler, having scored 12 of his victories by submission; he has proven himself to be an adept striker, most notably with his KO victory over Joe Stevenson and his TKO victory over former lightweight champion Takumi Nakayama.

After defeating Royce Gracie black belt Buddy Clinton on August 4, 2006, Danzig increased his winning streak to 12 in a row with a unanimous decision victory over Miletich fighter John Mahlow on September 29 in Calgary, Alberta Canada.

Anderson da Silva (Portuguese pronunciation: [ˈɐ̃deʁsõ ˈsiwvɐ]; born April 14, 1975) is a Brazilian mixed martial artist. He is the current UFC Middleweight Champion and the promotion's longest reigning champion. With 14 consecutive wins and 9 title defenses, Silva holds the longest winning streak and title defense streak in UFC history.

Silva is ranked as the number one Middleweight in the world by multiple publications, and is the consensus No. 1 pound-for-pound fighter in the world according to ESPN, Sherdog, Yahoo! Sports, MMAFighting.com and other publications. UFC president Dana White has proclaimed Silva as "the greatest mixed martial artist ever."^{[undue weight? – discuss]} Silva is also the last Cage Rage Middleweight Champion and a former Shooto Middleweight Champion. Besides the UFC and Cage Rage, Silva has fought for a number of other MMA promotions including the Pride Fighting Championships, Shooto and Rumble on the Rock.

Although known primarily for his mastery of Muay Thai striking, Silva is also a Brazilian Jiu-Jitsu blackbelt, a rank he earned in 2006 from Antônio Rodrigo Nogueira who follows Gracie Lineage through Carlson Gracie, like Murilo Bustamante and the Brazilian Top Team. He began martial arts training at the age of 14, training Tae kwon do and earning a black belt by the age of 18. He is also a black belt in Judo and a yellow rope in Capoeira.

Chael Patrick Sonnen (pronounced /ˈtʃeɪl ˈsʌnən/; born April 3, 1977) is an American mixed martial artist who competes as a middleweight in the Ultimate Fighting Championship. He was an NCAA Division I All-American wrestler at the University of Oregon, a silver medalist at the 2000 Greco-Roman World University Championships, as well as a two-time Dave Schultz Memorial International Greco-Roman winner.

As of October 2011^[update], Sonnen is ranked as the No. 2 middleweight in the world by Sherdog.

Sonnen was born Chael Patrick Sonnen on April 3, 1977 in West Linn, Oregon.

Sonnen started his MMA career at the age of 19 in 1997 by defeating Ben Hailey in Vancouver, Washington. His second fight was against future ICON Sport Middleweight Champion and Strikeforce Middleweight contender Jason "Mayhem" Miller. Sonnen went 6–0 in his first six fights, until his loss to Trevor Prangley, which he later avenged in 2006 at UFC Ultimate Fight Night 4. He also fought The Ultimate Fighter winner and former UFC Light Heavyweight Champion Forrest Griffin.