UFC 141: Lesnar vs. Overeem was a mixed martial arts event held by the Ultimate Fighting Championship on Friday December 30, 2011, at the MGM Grand Garden Arena in Las Vegas, Nevada.

The UFC returned to a 10 p.m. ET start with this event.

The winner of the main event is expected to face Junior dos Santos in a bout for the UFC Heavyweight Championship.

UFC 141 was the last event to feature preliminary fights live on Spike TV.

TJ Grant was originally scheduled to face Jacob Volkmann at this event but was forced to pull out due to an undisclosed injury, and was replaced by returning veteran Efrain Escudero.

Ramsey Nijem was scheduled to face Anthony Njokuani at the event but was forced to pull out due to an injury, and replaced by Danny Castillo.

Matt Riddle was scheduled to face Luis Ramos, but the bout was cancelled only moments before the fight due to Riddle being ill.

Fighters were awarded $75,000 bonuses.

The following is the reported payout to the fighters as reported to the Nevada State Athletic Commission. It does not include sponsor money and also does not include the UFC's traditional "fight night" bonuses.

Brock Edward Lesnar (/ˈlɛznər/; born July 12, 1977) is an American professional wrestler, actor, former mixed martial artist and amateur wrestler, signed with WWE and appearing on its Raw brand. He is also a former UFC Heavyweight Champion and former #1 ranked mixed martial arts (MMA) Heavyweight by Sherdog; he was ranked #5 before he announced his retirement at the end of 2011. Lesnar is an accomplished amateur wrestler, winning the 2000 NCAA heavyweight wrestling championship and placing second in 1999, losing in the finals to 1999 world freestyle wrestling champion and future New England Patriots offensive lineman Stephen Neal.

He gained prominence in World Wrestling Entertainment (WWE) from 2002 to 2004, where he is a former three-time WWE Champion, becoming the youngest WWE Champion at age 25 with his first reign. Lesnar was the 2002 King of the Ring and the winner of the 2003 Royal Rumble. After leaving WWE, Lesnar pursued a career in the NFL. He played during the preseason for the Minnesota Vikings, but ended up being a late cut. Lesnar returned to professional wrestling at the end of 2005, and joined New Japan Pro Wrestling (NJPW), where he won the IWGP Heavyweight Championship in his first match. He was officially stripped of the title by NJPW in July 2006, and took the physical belt with him to Inoki Genome Federation (IGF), where he was still recognized as IWGP Champion until June 2007.

Alistair Cees Overeem (born May 17, 1980) is a British born Dutch mixed martial artist and kickboxer, signed to the Ultimate Fighting Championship. He is the former Strikeforce Heavyweight Champion, Dream Heavyweight Champion, K-1 World Grand Prix Champion, and made history by being the only fighter in combat sports to hold a world title in both MMA and K-1 kickboxing at the same time. Alistair Overeem is ranked #3 in the heavyweight division.

Overeem was born on (1980-05-17)May 17, 1980, to a Dutch mother and Jamaican father. His parents divorced when he was six years old. His mother, Clair, then moved Alistair and his brother Valentijn to the Netherlands, where Alistair has lived ever since.

As a child, Overeem competed in sports like judo, athletics and basketball. At 15 years of age, his brother Valentijn took him to Chris Dolman's gym to teach him how to defend himself. At first he didn't like to train, but after training with Bas Rutten, Joop Kasteel and others, he eventually learned to enjoy it.

Dana White (born July 28, 1969) is the current President of the Ultimate Fighting Championship (UFC), a mixed martial arts organization based in the United States.

Born in Manchester, Connecticut on July 28, 1969, White grew up in Las Vegas, Nevada, Ware, Massachusetts and Levant, Maine. White is a passionate Boston Red Sox fan. During his youth, he bounced back and forth between Boston and Maine. He attended the University of Massachusetts Boston but did not finish; however, while there he did launch a boxing program for inner-city youth.

White has a background as an aerobics instructor. In 1992, White established Dana White Enterprises in Las Vegas. He conducted aerobics classes at three gyms in the Las Vegas area and began managing MMA fighters Tito Ortiz and Chuck Liddell.

While working as a manager, White learned that Semaphore Entertainment Group, the parent company of the UFC, was looking for a buyer for the UFC. White contacted childhood friend Lorenzo Fertitta, an executive at Station Casinos, and a former commissioner of the Nevada State Athletic Commission. Within a month, Lorenzo and his older brother Frank bought the UFC, with White installed as its president. White currently owns about 9% of Zuffa, LLC, the entity the Fertitta brothers created to own and manage the UFC.