UFC 65: Bad Intentions was a mixed martial arts competition held by the Ultimate Fighting Championship on November 18, 2006 at the ARCO Arena in Sacramento, California – the UFC’s first show at this venue.

The card featured the anticipated rematch between Matt Hughes and Georges St-Pierre for the UFC Welterweight Championship – a fight originally scheduled for UFC 63. UFC 65 also featured a heavyweight title bout between Undisputed UFC Heavyweight Champion Tim Sylvia and Jeff Monson.

This event marked the last time to date that a UFC card with two non-interim title fights featured the lower weight class' title fight as the card's main event. The UFC has since decided that all cards with two title fights will always have the heavier weight class' title fight as the main event.

UFC 65's original slated main event was a championship superfight with UFC Light Heavyweight Champion Chuck Liddell defending his title against PRIDE Middleweight Champion Wanderlei Silva, a matchup UFC President Dana White announced during UFC 61 on July 8, 2006. Since then, the matchup appeared to have been postponed or cancelled because Tito Ortiz had been guaranteed a title shot at UFC 66, which was too close to UFC 65, as White stated in several interviews.

Stefan J. Struve (born February 18, 1988) is a Dutch mixed martial artist who competes as a heavyweight in the Ultimate Fighting Championship. Struve is currently the tallest fighter in the UFC, standing 6 ft 11.5 in.

Growing up in the Netherlands, Stefan Struve played football until the age of 14. After his brother took him to the local martial arts gym (owned by Bob Schreiber), he decided to pursue a career in mixed martial arts instead. He had his first amateur MMA bout at age 16, and won via head kick knockout.

Struve made his professional debut for the GFN organization when he was 17, fighting John De Wilde at Gentlemen Fight Night. By late 2008, he had racked up a record of 16–2, losing once (in his second fight) via injury to Romualds Garkulis and again in the second round of a Star Of Peresvit tournament in Ukraine, to Christian M'Pumbu.

In 2008, Struve negotiated with the Dream and Affliction promotions, before signing a four-fight deal with the UFC.

Struve lost his UFC debut bout at UFC 95 to Junior dos Santos in the first round, after dos Santos stormed Struve with an aggressive flurry of punches. Struve won his next fight at UFC 99, over Denis Stojnic. Struve was cut open by hammerfists from Stojnic while on his back in the first round and, despite bleeding profusely, persevered in the second round and gained Stojnic's back, eventually locking in a rear naked choke to win by submission at 2:37 of the second round.

Junior dos Santos Almeida (Brazilian Portuguese pronunciation: [ˈʒũnjoʁ dus ˈsɐ̃tus]), also known as Junior Cigano ("Gipsy"; born September 12, 1984), is a Brazilian professional mixed martial artist and the current UFC Heavyweight Champion. He is ranked as the number one heavyweight fighter in the world by numerous media outlets.

Dos Santos started training Brazilian Jiu-Jitsu under Yuri Carlton for fitness reasons. After some time he was invited to join an MMA practice, where he met his boxing coach Luiz Carlos Dórea, and after roughly a year he made his debut fight.

Dos Santos became professional in 2006 at the age of 21. He fought in small promotions in Brazil, such as Demo Fight, Extreme Fighting Championship, Minotauro Fights and Mo Team League. He won 6 out of his first 7 bouts, suffering his only loss to Joaquim Ferreira, a fighter he'd previously beaten.

Dos Santos debuted for the UFC on October 25, 2008 at UFC 90. Considered a major underdog, dos Santos knocked out top contender Fabricio Werdum at a minute and twenty-one seconds of the first round with a strong uppercut, earning himself a "Knockout of the Night" award.

Georges St-Pierre (French pronunciation: [ʒɔʁʒ sɛ̃ pjɛʁ]; born May 19, 1981), often referred to as GSP, is a French Canadian mixed martial artist and the current Welterweight Champion of the UFC. St-Pierre is ranked as the No. 1 Welterweight in the world according to Sherdog, and numerous other publications. St-Pierre is ranked the No. 2 pound for pound fighter by ESPN sports,Yahoo! Sports (in 2011) and Sherdog. In 2008, 2009, and 2010 he was named the Canadian Athlete of the Year by Rogers Sportsnet.

Georges St-Pierre was born on May 19, 1981 in Saint-Isidore, Quebec, to Roland and Pauline St-Pierre. St-Pierre had a difficult childhood, attending a school where others would steal his clothes and money. He started learning Kyokushin karate at age seven from his father and later from a Kyokushin Karate Master to defend himself against a school bully. He took up wrestling and Brazilian Jiu-Jitsu after his karate teacher died (at this point he also trained in boxing). Before turning pro as a mixed-martial artist, St-Pierre worked as a bouncer at a Montreal night club in the South Shore called Fuzzy Brossard and as a garbageman for six months to pay for his school fees.

Dr. Rhadi Bullard Ferguson (April 3, 1975 - ) is an Bahamian American mixed martial arts trainer, strength and conditioning coach, motivational speaker, and black belt in judo and Brazilian jiu-jitsu.

Ferguson grew up in Miami, Florida where he began training in judo at the age of 7 under the tutelage of 7th degree red and white belt Jack Williams, until the age of 12. Ferguson had to quit judo for several years after his family had left Miami and moved to Rockville, Maryland and would not begin training again until after he finished college at age 22.

Ferguson is a four time national champion in judo. At the age of 29, Ferguson competed in judo at the 2004 Summer Olympics in Athens, Greece in the men's heavyweight division. He was previously an alternate in the 2000 Summer Olympics in Sydney, Australia.

In addition to judo, Ferguson also holds a black belt in Brazilian jiu-jitsu, and has competed in numerous jiu-jitsu and submission grappling tournaments. During his competitive career, Ferguson who stands 5 ft 9 in and weighed 225 lb. had a reported 5% body fat.