Saturday night, if you can resist the lure of the rickety dive bar around the corner or a Star Trek marathon with some of that stuff that just got legalized in Washington and Colorado, check out the UFC on FOX, the promotion's fifth card on the network.

Free, high-quality MMA on TV is far from widely available, which makes enjoying UFC on Fox cards all the more imperative. 

The four-fight showcase includes a title fight between ironclad champion Benson Henderson and testy contender Nate Diaz. Additionally, Mauricio "Shogun" Rua will face off against young gun Alexander Gustafsson in what Dana White has pegged as a #1 contender fight for the light heavyweight strap, though we've seen the president rescind those promises in the past due to injuries or a more compelling fight becoming available. 

And, to add another layer of intrigue, MMA legend B.J. Penn returns from his self-imposed retirement to take on top welterweight prospect Rory MacDonald.