UFC 99: The Comeback was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on June 13, 2009 in Cologne, Germany. It was the first UFC event held in Germany, as well as the first in mainland Europe (events have previously been held in the United Kingdom, Ireland, Canada, the continental United States, Brazil, and Japan).

On Monday, June 1, the UFC announced that Mirko "Cro Cop" Filipović would be returning to the promotion to face Mostapha Al-turk at UFC 99. It was Filipović's first fight in the UFC since his unanimous-decision loss to Cheick Kongo at UFC 75 in 2007.

An announced bout between Heath Herring and Cain Velasquez was cancelled due to an illness that Herring was suffering. On May 20, 2009, Cheick Kongo was announced as the replacement.

The Struve – Stojnic fight was infamous for the huge cut and tremendous blood loss incurred by Struve. There was already a good deal of anti-MMA sentiment in Germany; and the photo of the gash across the heavyweight's forehead provided increased negative publicity.

Wanderlei César da Silva ( /ˈvændərleɪ/ VAN-dər-lay; Portuguese: [vɐ̃dɛɾˈlej ˈsɛzɐr dɐ ˈsiɫvɐ];Japanese: [ba̠nda̠ɽe̞i ɕiü͍βa̠]; born July 3, 1976), nicknamed "The Axe Murderer", is a Brazilian mixed martial artist, who has competed in Japan's Pride Fighting Championships and the American based Ultimate Fighting Championship (UFC). Silva is known for his aggressive fighting style with the majority of his fights ending in knockout or referee stoppage due to strikes. His style includes engaging opponents with punches and knees from the Muay Thai clinch. He holds the record for the most wins and knockouts in Pride FC history. He is currently ranked as #22 best middleweight fighter in the world by FightMatrix.com.

Silva began his training under Rudimar Fedrigo at the Chute Boxe Academy in his hometown of Curitiba, Brazil. Although he specializes in muay Thai, he has also trained and received his black belt in Brazilian jiu-jitsu from trainer Cristiano Marcello. Silva was given the nickname "Cachorro Louco" ("Mad Dog") in Brazil because of his aggressive style and his pre-fight opponent "stare down". He is the former IVC Light heavyweight Champion, former PRIDE Middleweight Champion, and the 2003 PRIDE Middleweight Grand Prix Tournament Winner.

Rich Jay Franklin II (born October 5, 1974) is an American mixed martial artist and former UFC Middleweight Champion.

Franklin was born to Richard Sr. and Vaila Franklin. The couple divorced when Rich was five years old. He has one biological brother, Greg, and five step-siblings.

Prior to becoming a full time MMA fighter, Franklin graduated from William Henry Harrison High School. He earned a bachelor's degree in mathematics and later earned a master's degree in education at the University of Cincinnati, and taught mathematics at the Oak Hills High School in Cincinnati, Ohio.

Franklin and American Fighter President Jeff Adler created The Keep It In The Ring Foundation to advocate non-violence and build character in youth. This is done through after school sports, martial arts and life skills programs. His nickname "Ace" comes from his resemblance to Jim Carrey, who played the character Ace Ventura. Joe Rogan once called him "An angry Jim Carrey". Franklin made his acting debut in a film called Cyborg Soldier where he plays an escaped super soldier and partners with Tiffani Thiessen.

Cain Velasquez Ramirez (born July 28, 1982) is a Mexican American mixed martial artist fighting in the Ultimate Fighting Championship where he is a former UFC Heavyweight Champion. He is a two-time All-American collegiate wrestler from Arizona State University in Tempe, Arizona, and a Junior College National Champ at Iowa Central Community College. He is a two-time 5A state champion in Arizona, compiling a record of 110–10 for Kofa High School in Yuma, Arizona. Cain Velasquez is ranked #2 in the heavyweight division.

Velasquez, a Mexican American, was born on July 28, 1982 in Salinas, California to Efrain and Isabel Velasquez. Velasquez's father, Efrain, came from Mexico to the United States illegally. Efrain met his wife Isabel, married her, and gained US citizenship. Velasquez has two siblings, Efrain, Jr., and Adela. He was raised in Yuma, Arizona. He graduated from Kofa High School, where he compiled a record of 110–10 in four years of wrestling, including winning the 5A Arizona Wrestling Championship twice. Velasquez also played football for three years. As a senior, he served as Captain of both his wrestling and football teams.

Cheick Guillaume Ouedraogo (born May 17, 1975), more commonly known as Cheick Kongo, is a professional French heavyweight mixed martial artist and kickboxer currently fighting in the Ultimate Fighting Championship. He currently trains with Quinton "Rampage" Jackson and formerly Michael Bisping at the Wolfslair MMA Academy, and holds notable wins over Mirko Filipović, Paul Buentello, Antoni Hardonk, Matt Mitrione, and Pat Barry. He is also the only fighter to have ever gone to a decision with former heavyweight champion, Cain Velasquez. Kongo is ranked the 10th best heavyweight in the world by ESPN.

Born to a Burkinabé father and a Congolese mother with his brother, Ben Millard, Kongo began training in martial arts when he was 5 years old, learning Kendo and Karate. As he grew older, he began to expand his repertoire and trained in Muay Thai, kickboxing and Greco-Roman wrestling. At age 19, he learned of Pencak Silat, an Indonesian martial art, and was coached by Charles Joussot, Franck Roppers and his brother Ben. He's also a cousin of rugby star Fulgence Ouedraogo, the French back-rower. Cheick is also a columnist for the French MMA magazine, Top Fight.