DEMOCRATIC PRESIDENTIAL DEBATE 8 p.m. on CNN and Univision. Oh, how the world has changed since the last Democratic debate on Feb. 25. That night saw a crowded stage. Seven candidates vied to make their voices heard before Super Tuesday, and Senator Bernie Sanders was still the projected front-runner. Now two candidates remain, Sanders and former Vice President Joseph R. Biden Jr. And the nation is scrambling to contain the spread of the coronavirus, which is why this debate, originally planned for Phoenix, has been moved to Washington to be filmed in a studio with no audience. Biden has been endorsed by several former candidates and politicians, while Sanders has vowed to power through, despite recent losses in several states. On Sunday, they likely will attack President Trump’s handling of the health crisis, and Sanders is expected to challenge Biden on his policies and ability to defeat the president.

BLACK MONDAY 10 p.m. on Showtime. This comedy series about the stock market crash of 1987 is darkly resonant after Wall Street’s fall this week, its worst since then. The second season chronicles the fallout of the crash. Mo (Don Cheadle) is on the run after being framed for murder while his former colleagues (played by Regina Hall and Andrew Rannells) carry on with their conniving ways.