Watch UFC 155 online tonight (Dec. 29): Live video stream/PPV details for 'Dos Santos vs Velasquez 2'

Let's do it again.

Ultimate Fighting Championship (UFC) will once again air an entire fight card TONIGHT (Dec. 29, 2012), its last major pay-per-view (PPV) event of the year, when Junior dos Santos and Cain Velasquez hook 'em up in a Heavyweight main event rematch more than one year in the making.

UFC 155: "Dos Santos vs. Velasquez 2," which will emanate from the MGM Grand Garden Arena in Las Vegas, Nevada, will begin around 6:35 p.m. ET with the Featherweight fight between Leonard Garcia vs. Max Holloway that will stream LIVE on Facebook.com.

Once the two-hour long Facebook stream ends, the rest of the "Prelims" under card will begin to air live on FX at 8 p.m., featuring fights between Brad Pickett vs. Eddie Wineland
 and Melvin Guillard vs. Jamie Varner, among others.

There are tons of ways to watch the pay-per-view (PPV) main card tonight, which begins at 10 p.m. ET. The main event, of course, will feature the aforementioned colossal clash of champions, current and former, when "Cigano" collides with "Brown Pride."

You can call up Comcast or your local cable and/or satellite provider (DirecTV, DISH Network, etc.) and order the PPV on your television. For the Internet folks among us, you can also stream the event on your computers using UFC.TV, Yahoo! Sports or UStream, among others.

And if you're really in a pinch, you can watch UFC 155 on your mobile phone via the Android Market and AppStore or even now on YouTube.com and Roku. Gamers can also catch the UFC 155 action on Xbox Live with the help of their video game consoles.

Want to watch UFC 155 at a local bar? Find out which establishments near you are showing the fights tonight right here.

However, if you need your UFC 155 results as soon as possible, for free, MMAmania.com will deliver up-to-the-minute results and live fight coverage, including round-by-round, blow-by-blow coverage of all the UFC 155: "Dos Santos vs. Velasquez 2" action before, during and after the event RIGHT HERE.

More details on the UFC 155 fight card, who is fighting who, as well as how to keep yourself updated all night long, below:

Main Event:

265 lbs.: UFC Heavyweight Champion Junior dos Santos vs. Cain Velasquez

Main Card On Pay-Per-View (PPV):

155 lbs.: Joe Lauzon vs. Jim Miller

185 lbs.: Tim Boetsch vs. Constantinos Philippou

185 lbs.: Alan Belcher vs. Yushin Okami

185 lbs.: Chris Leben vs. Derek Brunson

"Prelims" Under Card On FX:

135 lbs.: Brad Pickett vs. Eddie Wineland

135 lbs.: Byron Bloodworth vs. Erik Perez

155 lbs.: Melvin Guillard vs. Jamie Varner

155 lbs.: Michael Johnson vs. Myles Jury

"Prelims" Under Card On Facebook:

265 lbs.: Philip De Fries vs. Todd Duffee

125 lbs.: Chris Cariaso vs. John Moraga

145 lbs.: Leonard Garcia vs. Max Holloway

To watch the UFC 155 "Prelims" on Facebook, (if you have a Facebook profile) simply "Like" the UFC Facebook page and check out the "UFC Live Streams" tab on the left-side menu.

Remember, too, that our round-by-round results of the under card fights on Facebook/FX will begin to flow around 6:30 p.m. ET later this evening and run right on through to our main card PPV coverage, which is set to start at 10 p.m. ET.

To get up to speed on all the news and notes for UFC 155: "Dos Santos vs. Velasquez 2" be sure to hit up our comprehensive event archive right here.