Jermell Charlo answered incredulously once FOX Sports’ Brian Campbell asked how his rematch against Tony Harrison will be different.

“How the rematch gonna be different?,” an animated Charlo replied during an upcoming episode of FOX’s “PBC Face To Face” series. “I’m gonna knock his ass out! How the rematch gonna be different? It’s easy to explain that.”

Houston’s Charlo (32-1, 16 KOs) will try to win back his WBC super welterweight title from Detroit’s Harrison (28-2, 21 KOs) on December 21 in Ontario, California. Their 12-round rematch will headline FOX’s tripleheader from Toyota Arena.

Harrison upset Charlo by 12-round unanimous decision nearly a year ago to win that 154-pound championship from him. An inactive Harrison hasn’t fought since that career-defining victory last December 22 because he suffered an ankle injury that postponed their rematch, which was supposed to take place June 23 at Mandalay Bay Events Center in Las Vegas.

“I’m gonna dominate that man,” Harrison promised during FOX’s “Face To Face” segment. “I’m gonna dominate that man.”

The 29-year-old Charlo scoffed at Harrison’s prediction.

“I don’t like Phony Harrison,” Charlo said. “Phony Harrison is his name. Phony and Ja Fool. Ja Fool. I’m a giant. I’m a tycoon in this. And I’m a real tycoon, and I run this. And unfortunately, you don’t even know you can’t back up not one word you say.”

Harrison, who’s also 29, dismissed Charlo’s knockout prediction, as well as his opponent’s other trash talk.

“Come on, man,” Harrison said. “Stop it. Like I said, he gonna talk, man. He gonna live in his own little fantasy. As long as he’s walking this earth, there’s nothing he can do to beat me. I won’t lose to suckers!”

Despite losing their first fight, Charlo has been installed as slightly more than a 2-1 favorite to beat Harrison in their rematch.

If nothing else, Charlo has been more active than Harrison. Once Harrison withdrew from their rematch, Charlo knocked out his replacement, Mexican veteran Jorge Cota, in the third round June 23.

“PBC Face To Face: Tony Harrison Vs. Jermell Charlo II” will premiere on FOX on Saturday at 2:30 p.m. ET. That 30-minute show will be immediately followed at 2:30 p.m. ET by the one-hour “PBC Countdown: Tony Harrison Vs. Jermell Charlo lI” special.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.