9 p.m., ABC

Modern Family

Elizabeth Banks guest-stars as Sal, Mitchell (Jesse Tyler Ferguson) and Cameron's (Eric Stonestreet) crazy friend—and she's a little jealous of Lily. Ed Norton also guest-stars as a has-been musician.

9 p.m., FOX

Glee

Mr. Schuester (Matthew Morrison) decides to split New Directions into couples to sing ballads, but things gets awkward when one student gets sick.

9 p.m., NBC

Law and Order: SVU

DNA evidence reveals Detective Benson (Mariska Hargitay) as the prime suspect in a murder case.

10 p.m., ABC

In the Spotlight with Robin Roberts

Robin Roberts interviews Janet Jackson.

Season 13 finale, 10 p.m., COMEDY

South Park

In an episode called "Pee," the boys take a trip to Pipi's Spash Town, a water park.

Also on the airwaves ...
Man v. Food, 7 p.m., TRAVEL
The New Adventures of Old Christine, 8 p.m., CBS
So You Think You Can Dance, 8 p.m., FOX
Mercy, 8 p.m., NBC
America's Next Top Model, Cycle 13 finale 8 p.m. & 9 p.m., CW
The Middle, 8:30 p.m., ABC
Gary Unmarried, 8:30 p.m., CBS
Criminal Minds, 9 p.m., CBS
Cougar Town, 9:30 p.m., ABC
CSI: NY, 10 p.m., CBS
Top Chef, 10 p.m., BRAVO
Nip/Tuck, 10 p.m., FX

What are you watching tonight?