UFC 85: Bedlam was a mixed martial arts event held by the Ultimate Fighting Championship (UFC), on June 7, 2008 at The O₂ arena in London, England.

The card was plagued by a number of injuries sustained by scheduled fighters, forcing the UFC to rework the card several times. Originally, the main event was to be between light heavyweights Chuck Liddell and Mauricio Rua; however, Rua required surgery on an injured knee and could not compete. Rashad Evans then replaced Rua in the main event with Liddell, but Liddell was forced to withdraw from the card due to a hamstring injury.

The UFC then named James Irvin as Liddell's replacement to fight Evans, but Irvin sustained a foot injury that forced him to pull out. Evans was then removed from the card as well. The main event was then changed to Matt Hughes against Thiago Alves. Hughes took the fight on short notice as a favor to the UFC and Alves came in four pounds overweight.

In other changes, a Jonathan Goulet and Paul Kelly match was scrapped when Goulet dropped out citing a lack of training time, followed by Kelly withdrawing before his opponent could be named because of an injury sustained in practice. Due to legal problems which resulted in a lack of time to prepare for his fight with Michael Bisping, Chris Leben was forced to withdraw from the card and the UFC announced Jason Day would face Bisping. Ryo Chonan was replaced by Kevin Burns, and Neil Wain was replaced by Eddie Sanchez.

Thiago Alves d'Araujo (Portuguese pronunciation: [tʃiˈaɡu ˈawvis]; born October 3, 1983) is a Brazilian mixed martial artist currently competing as a welterweight in the Ultimate Fighting Championship. He started training in Muay Thai when he was 15 and mixed martial arts at 17. He is a brown belt in Brazilian Jiu-Jitsu and has been described as a "Muay Thai wrecking machine".

After beginning his fight training at the age of 14, Alves won his first professional bout at just 15 years old, defeating a 25-year-old by unanimous decision. At 19, Thiago relocated from Brazil to Coconut Creek, Florida to train full-time at the prestigious American Top Team camp.

After beginning his career in smaller organizations such as the Ironheart Crown, Absolute Fighting Championships and King of the Cage, Alves, with a record of 8–3, received an invitation to make his UFC debut at Ultimate Fight Night 2 against fellow UFC newcomer Spencer Fisher, The fight would take place on Alves' twenty-second birthday.

Michael Gavin Joseph Bisping (born 28 February 1979) is an English mixed martial artist. He fights in the middleweight division of the Ultimate Fighting Championship and is the former Cage Warriors Fighting Championship Light Heavyweight Champion, former Cage Rage Light Heavyweight Champion and The Ultimate Fighter 3 Light Heavyweight Tournament winner. As of March 2012, Bisping is ranked the No. 4 middleweight in the world by Sherdog.

Bisping was born in manchester UK in 1979, but moved to Bridlington, East Yorkshire, England when he was a child. Taking an early interest in martial arts, Bisping began training in a traditional form of jiu-jitsu known as Yawara Ryu under Paul Lloyd Davies when he was 8 years old. In 1994, at the age of 15, Bisping competed as an amateur in England's first "no holds barred" competition, a precursor to modern MMA, called Knock Down Sport Budo (KSBO), organised by Davies.

At the age of 18, Bisping decided to abandon his martial arts training in order "to pursue real life". But less than a year later Bisping began training kickboxing and karate on the advice of Alan Clarking, owner of Black Knights gym, who saw potential in the young fighter. Bisping enjoyed a short, but successful kickboxing career, winning the North West Area title and later the Pro British light heavyweight kickboxing title. After again briefly quitting competition in 1998, Bisping returned to kickboxing to take the Pro British light heavyweight title for a second time. Soon after winning his second kickboxing title, Bisping was forced to abandon his full-time training for a "real job". Bisping worked in factories, slaughterhouses, as an upholsterer, a postman, a tiler, a plasterer, a double-glazing door salesman,production line operative making barbecues at Rectella in Clitheroe and also a relatively successful DJ around the north-west club scene.

Charles David "Chuck" Liddell (born December 17, 1969) is a retired American mixed martial artist and former Ultimate Fighting Championship light heavyweight champion. Liddell has an extensive striking background in Kempo, Koei-Kan karate and kickboxing, as well as a grappling background in collegiate wrestling. Liddell is known for his Knockout power, Iron chin, Excellent counter striking and for his sprawl-and-brawl technique, which made him one of the most difficult fighters to takedown. He is one of the most dominant champions that ever competed in the UFC. He still holds the record for the most knockouts in UFC history. As of his retirement, Liddell has had 23 fights in the UFC. Along with fellow UFC Hall of Fame fighter Randy Couture, Liddell is widely credited for bringing mixed martial arts into the mainstream of American sports and entertainment. On July 10, 2009, he was inducted into the UFC Hall of Fame.

Liddell began studying Koei-Kan karate at the age of 12; the tattoo seen on his scalp reads "Koei-Kan". Liddell was a four-year starter on the football team at San Marcos High School. While growing up in Santa Barbara, he often frequented the infamous Del Playa Drive, the middle of the party scene of the college town of Isla Vista, where he often found himself in fights with drunk college students. He became a Division I wrestler at California Polytechnic State University, San Luis Obispo and graduated with a Bachelor of Arts Degree in Business/Accounting in 1995. He holds an amateur kickboxing record of 20 wins and 2 losses, with 16 of his wins coming by way of knockout.

Sean Keith Sherk (born August 5, 1973) is an American mixed martial arts fighter currently fighting for the UFC. He currently holds a professional mixed martial arts (MMA) record of thirty-six wins, four losses and one draw. Sherk has fought in both the UFC and Pride FC, and is a former UFC Lightweight Champion. His only four MMA losses are to former UFC champions BJ Penn, Matt Hughes, Frankie Edgar and current Undisputed UFC welterweight champion Georges St. Pierre.

Sherk began fighting MMA in June 1999, where he originally fought at the welterweight weight-class. During his time as a welterweight, Sherk suffered two losses; one to Matt Hughes and one to Georges St. Pierre. In 2006, Sherk decided to drop down to the lightweight class of 155 lb. In his first fight as a lightweight, Sherk defeated Kenny Florian to become the first UFC Lightweight Champion in over four years. After his first successful defense with the title, Sherk was stripped of the title after testing positive for steroids, an accusation he unsuccessfully fought against in a series of hearings. Upon his return in May 2008, Sherk failed to win back the title from then champion, B.J. Penn.