A collection of UFC knockouts, all coming from devastating knees -- some of the most effective strikes inside the Octagon; featuring Marlon Moraes, Jeremy Stephens, Carlos Condit, Ricardo Lamas, Jose Aldo and Anderson Silva.

A look at some surprising knockouts from the UFC.

A look at the Ultimate Fighter coaches.

Looking back at the best knockouts from the past year.

In the Octagon, even the smaller fighters pack some big striking power. See a collection of UFC knockouts, all coming from the lighter weight classes. Featuring Cody Garbrandt, Paige VanZant, John Lineker, Yair Rodriguez, and Ronda Rousey.

See the wild finishes that put up-and-coming fighters on the fast-track to becoming big stars. With Conor McGregor, Cat Zingano, Myles Jury, and more.

Flying knees, spinning kicks and backfists are just a few of the methods used to end fights in this episode of UFC Ultimate Knockouts. Featuring Carlos Condit, Travis Browne, Dennis Siver, Renan Barao and more.

Featuring Chuck Liddell, Jon Jones, Anderson Silva, Cain Velasquez and more.

The greatest finishers from the heavyweight division including Cain Velasquez, Minotauro Nogueira, Junior dos Santos, Andrei Arlovski and more.

We bring you exciting finishes from the top-tier fighters who first made their names on The Ultimate Fighter reality show, including Rashad Evans, Diego Sanchez, Roy Nelson, Nate Diaz, and TJ Dillashaw.

Fastest finishes in MMA history -- knockouts that took 60 seconds or less. With Johny Hendricks, BJ Penn, The Korean Zombie and more.

A look at the greatest knockouts to take place inside the Octagon in 2016. Featuring Garbrandt vs. Almeida, Miocic vs. Werdum, Woodley vs. Lawler, Bisping vs. Rockhold 2, Paige VanZant vs. Bec Rawlings, Dan Henderson vs. Hector Lombard and many more.

Knockouts that define the career of UFC fighters inside the Octagon.

Conor McGregor, Michael Bisping, Alexander Gustafsson, Lyoto Machida, Yoel Romero, Joanna Jedrzejczyk and more.

Fight finishes from the flyweight, bantamweight, featherweight and lightweight divisions, including the best from superstars such as Ronda Rousey, Conor McGregor, Jose Also, Donald Cerrone and more.

Featuring the best knockouts from 2014.

A look at highlight knockouts from the UFC.

Fights that end via perfectly thrown counterpunches. Featuring Conor McGregor, Stipe Miocic, Chuck Liddell, Shogun Rua and more.

Great fight finishes from the sport's best knockout artists. Featuring Anderson Silva, Vitor Belfort, Anthony "Rumble" Johnson, Andrei Arlovski, Roy Nelson and more.

The best knockouts from 2015, an action-packed year inside the Octagon. Featuring Ronda Rousey, Stephen "Wonderboy" Thompson, Dan Henderson, Holly Holm, Uriah Hall and more.

Athletic alumni of the Strikeforce promotion ply their trade in the UFC Octagon and the Strikeforce hexagon. With Ronda Rousey, Robbie Lawler, Daniel Cormier, Cris Cyborg, Alistair Overeem and more.

Enhanced replays of memorable fights.

"UFC Unleashed" features the greatest moments from the Ultimate Fighting Championship's vast library of mixed martial arts footage, including matchups that were previously exclusive to pay-per-view audiences. As opposed to simple highlights, "Unleashed" treats fans to bouts in their entirety, from the opening bell to the knockout, tap out or decision, and some episodes consist of a "best of" compilation featuring one UFC star.

Features showdowns between contestants of the Ultimate Fighting Championship.

One of the biggest advantages for MMA fans resulting from UFC's programming shift to Fox in 2011 is the mixture of content -- both events and series -- produced for Fox-owned Fuel TV. Some of the best comes in the form of the three-hour, mano-a-mano extravaganza "UFC Reloaded," a re-air of the biggest and most memorable UFC pay-per-view events in history. Of course, the fight results are history, too, but seeing the battles for the first time (or once again) is usually worth the wait, and it's free! The series also features footage that was never shown on the original PPV broadcast.

UFC's biggest stars weigh-in and face-off before battles inside the Octagon.

Special programs presented by UFC.