Alistair Overeem made a strong first impression in his UFC debut taking down Brock Lesnar in the first round at UFC 141. Overeem faces Andrei Arlovski on May 8 at Fight Night Rotterdam.

Going into the Octagon with seven consecutive victories, Alistair Overeem battles the former heavyweight champ Brock Lesnar to see who gets a heavyweight title shot. Watch Overeem take on Stefan Struve on the main card at UFC Fight Night Phoenix.

Nate Diaz locks in a killer triangle choke, then seals it with his signature Stockton salute.

Take a look back at the best behind-the-scenes moments of UFC 141.

After all the trash talk leading up to their bout, Nate Diaz and Donald Cerrone break down their fight and show mutual respect at the post-fight press conference.

It wasn't the performance he wanted, but Danny Castillo wins a decision over Anthony Njokuani to close out 2011 with a record of 3-1. Hear his thoughts on the fight, and the reaction from the crowd.

"I knew I had to be going forward." Jim Hettes improves to 2-0 in the UFC after dominating Nam Phan. "The Kid" explains how the heavyweight title fight between Brock Lesnar and Shane Carwin factored into his strategy.

Jon Fitch beats the clock with a vice-like rear naked choke of TUF vet Josh Burkman at UFC® Fight Night™ 4.

The grudge match fueled by trash-talk and distaste will finally reach the Octagon when Nate Diaz and Donald Cerrone meet at UFC 141 Tonight!

UFC® 141 Prelim: Ross Pearson vs. Junior Assuncao

UFC® 141 Prelim: Anthony Njokuani vs. Danny Castillo

UFC® 141 Prelim: Jacob Volkmann vs. Efrain Escudero

Watch the official weigh-in for UFC 141: Lesnar vs. Overeem.

Watch the UFC 141 pre-fight press conference with Dana White, Brock Lesnar, Alistair Overeem, Nate Diaz and Donald Cerrone.

Featherweight belt-holder Jose Aldo has a message to teammates Luis Ramos and Diego Nunes in the final hours before their bouts Friday at UFC® 141. Both prelim fights can be seen live and free on Facebook starting at 6:50/3:50PM ET/PT Friday, December 30.

Dana White and Craig Borsari put an end to the Fastest UFC Knockout debate as they break down three candidates with time-coded footage.

A good-natured fan favorite takes on a dry-witted submission specialist - Nam Phan and Jim Hettes look to put on an entertaining bout.

Alistair Overeem predicts a wild, crazy fight against Brock Lesnar that is contingent on him landing punches... repeatedly.

Highlight-reel favorite Anthony Njokuani faces ground-and-pounder Danny Castillo in a battle of WEC vets, plus Ross Pearson dips to featherweight to battle Junior Assuncao live on TV and UFC.TV.

The light-heavyweight Mauler looks to continue his climb up the ranks with a once-postponed match against veteran Vladimir Matyushenko.

Top welterweight Jon Fitch is eager to return to the Octagon, and Johny Hendricks can't wait to show the world he's a top-level fighter. Hear what they have in store, besides their wrestling pedigrees.

See Nate Diaz take on a former opponent of his brother's in PRIDE star Takanori Gomi.

Take a look back at never-seen before footage from UFC 140: Jones vs Machida.

Countdown to UFC 141: Diaz v. Cerrone - Nate Diaz and Donald "Cowboy" are both great at two things - talking trash, and backing it up in the Octagon™.

Countdown to UFC 141: Lesnar vs. Overeem - Two very big men with very heavy hands will meet at UFC® 141, as former heavyweight champ Brock Lesnar welcomes former STRIKEFORCE® champ Alistair Overeem into the Octagon™.

The fans weigh in on who will be victorious at UFC® 141: Lesnar vs. Overeem.

It's been a long coming, but now it's finally here. Vladimir "The Janitor" Mayushenko takes on Alexander "The Mauler" Gustafsson at UFC® 141. Hear why Vlad thinks he's in the perfect position to stop Gustafsson's ascent up the light heavyweight ladder.

Alexander Gustafsson uses vicious Ground and Pound to set up a rear naked choke against Cyrille Diabate at UFC® 120.

"Look good, feel good, fight good." Donald Cerrone respects Nate Diaz as a fighter, but feels he's the best striker in the lightweight division. Hear why, come Hell or high water, "Cowboy" will be ready to fight Dec. 30th.

In a welterweight bout, Brazil’s Luis “Beicao” Ramos goes toe-to-toe against TUF7 alum Matthew Riddle, known for his spectacular Simmler KO. Facebook streams start at 7:15PM/4:15PM ET/PT on Friday, December 30th for UFC® 141: Lesnar vs Overeem.

The iron-chinned Nate Diaz dares Cowboy Cerrone to knock him out... if he knows what's good for him.

A bitter rivalry finally comes to the Octagon as Diego Nunes faces Manny Gamburyan at UFC® 141. Watch their fight live on UFC's Facebook page - streams start at 7:15PM/4:15PM ET/PT on Friday, December 30th.

In his first fight since winning The Ultimate Fighter, Efrain Escudero got a big step up in competition... and showed he was perfectly up for the challenge.

After a loss to Frank Mir in his UFC debut, some MMA fans were wondering if pro wrestler Brock Lesnar had what it took to make it in the Octagon. See how he answered those questions at UFC 87.

Brock Lesnar prepares to return to the Octagon and defend his cage when he welcomes Alistair Overeem to the UFC.