UFC Full Fight Download: Watch Demetrious Johnson Knock Out Joseph Benavidez

Flyweight king Demetrious Johnson scored the first knockout of his Octagon career in December 2013, when he flattened Joseph Benavidez to retain the 125-pound crown at UFC on Fox 9. “Mighty Mouse” will go for his seventh consecutive title defense -- the longest streak amongst active UFC champions -- when he meets Henry Cejudo this Saturday at UFC 197.