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In anticipation of their UFC 121 main-event fight, UFC heavyweight champion Brock Lesnar (5-1 ) and undefeated challenger Cain Velasquez (8-0) will be featured in the latest edition of Spike TV's three-part "UFC Primetime" special.

"UFC Primetime: Lesnar vs. Velasquez" debuts Oct. 6, at 11 p.m. Subsequent episodes air in the timeslot on Oct. 13 and Oct. 20.

UFC 121 takes place Oct. 23 at the Honda Center in Newark, Anaheim, Calif., and airs on pay-per-view.