"Countdown" to UFC 155: "Dos Santos vs. Velasquez 2" debuted last night (Tues., Dec. 25, 2012) on FUEL TV to promote the upcoming pay-per-view (PPV) event scheduled for this Saturday night (Dec. 29) at the MGM Grand Garden Arena in Las Vegas, Nevada.

The network special gave mixed martial arts (MMA) fans a glimpse into the preparation and training camps of the fighters set to headline the show, featuring a rematch between reigning UFC Heavyweight Champion Junior dos Santos and former division kingpin Cain Velasquez.

In addition to "Dos Santos vs. Velasquez," the following UFC 155 fight card match ups were featured on the show: Joe Lauzon vs. Jim Miller, Tim Boetsch vs. Constantinos Philippou and Alan Belcher vs. Yushin Okami.

MMAmania.com will provide LIVE round-by-round, blow-by-blow coverage of the main card action on fight night (Sat., Dec. 29, 2012), which is slated to air at 10 p.m. ET on PPV. The latest quick updates of the live action will begin to flow earlier than that around 6:30 p.m. ET with the "Prelims" bouts on Facebook and FX Channel.

For the latest UFC 155 news and notes check out our complete event archive right here. To check out the latest "Dos Santos vs. Velasquez" fight card and rumors click here.