Fox, 8 ET/PT
Remember Sam, the second-season guy Jess was dating until Nick got in the way? Well, he’s back (played, once again, by David Walton) — and this time he’s dating the principal of a school where Jess is applying for a job.
CW, 8 ET/PT
Barry isn’t just traveling at lightning speed these days; he’s traveling a lot. Monday, he switched universes to visit Supergirl. Back on his own show, he’s traveling through time to pry some secrets out of the evil version of Dr. Wells. Unfortunately, he’s distracted when he runs into Hartley and Eddie (returning guest stars Andy Mientus and Rick Cosnett). Which really should teach Barry to stay home for awhile.
The Late Late Show Carpool Karaoke Primetime Special
CBS, 10 ET/PT
As you probably know, James Corden’s Late Late Show has been setting social media on fire with its "Carpool Karaoke" — a simple stroke of TV genius that has Corden driving around in his car singing hit songs as the person who made them hits sings next to him in the passenger seat. Anyone wondering how so basic a bit can possibly generate an hour-long primetime special should look up the car ride Corden took with Adele, which besides being amusing and adorable is as fine a salute to the joy of making music as you’ll find anywhere.