UFC Unleashed is a 1 hour TV program that originally aired on SpikeTV but now airs on Fuel TV. The show airs full fights from previous UFC events for viewers who weren't able to watch the PPVs live but still want to watch the fights afterwards, even though you usually have to wait a few months after a particular fight took place before they decide to put it on an episode of Unleashed.
Usually every episode of Unleashed consists of roughly about 3 fights. The first 2 fights each episode shows are usually non main event caliber fights while the final fight ala main event on an episode usually involves a much more marquee fighter in the fight.
Good thing about Unleashed is since they get to pick and choose which fights that air on the show they don't choose any clunkers to be a part of the show.