What’s on TV

DEMOCRATIC PRESIDENTIAL DEBATE 8 p.m. on CBS. Seven candidates have qualified for this debate in Charleston, S.C.: Senator Bernie Sanders of Vermont, former Vice President Joseph R. Biden Jr., Senator Elizabeth Warren of Massachusetts, former Mayor Michael R. Bloomberg of New York, former Mayor Pete Buttigieg of South Bend, Ind., Senator Amy Klobuchar of Minnesota; and the billionaire businessman Tom Steyer. A lot is riding on their performances. The debate comes four days before the South Carolina primary and just before the Super Tuesday primaries and caucuses on March 3. Bloomberg may try to redeem himself after scathing attacks on the debate in Las Vegas last week. Warren came out strong with an aggressive performance, while Sanders walked away mostly unharmed, politics reporters for The New York Times wrote in an analysis.

GORDON RAMSAY’S 24 HOURS TO HELL AND BACK 8 p.m. on Fox. In this two-hour season finale, the host Gordon Ramsay tries to save a pizza restaurant and a Korean-inspired eatery in Arkansas. The owner of the pizza place is prone to violent outbursts, while the owner of the Korean-inspired joint lacks the industry know-how to run a successful business.