9 p.m., NBCMariska Hargitay) and Stabler (Christopher Meloni) find themselves in danger while investigating the death of an environmentalist, and the situation inspires Benson to reflect on her past.
9 p.m., CWSharon Leal) performs at the Hellcats’ 80s-themed anniversary party and Savannah (Ashley Tisdale) plans a romantic evening with Dan (Matt Barr).
9 p.m., HIST
Marijuana: A Complicated HistoryThis two-hour special investigates pot use in America and the action taken to stop its distribution.
9:30 p.m., ABCBusy Philipps) and Grayson (Josh Hopkins) team up against Ellie (Christa Miller-Lawrence) to see who can get Jules (Courteney Cox) the best present for her 42nd birthday.
11:35 p.m., CBS30 Rock star Tina Fey.
12:35 a.m., NBCZach Galifianakis.
Also on the airwaves...
The Middle, 8 p.m., ABC
Survivor, 8 p.m., CBS
Undercovers, 8 p.m., NBC
America’s Next Top Model, 8 p.m., CW
Better with You, 8:30 p.m., ABC
Modern Family, 9 p.m., ABC
Criminal Minds, 9 p.m., CBS
MythBusters, 9 p.m., DSC
Ghost Hunters, 9 p.m., Syfy
Man v. Food, 9 p.m., TRAVEL
In the Spotlight with Robin Roberts: All Access Nashville, 10 p.m., ABC
The Defenders, 10 p.m., CBS
, 10 p.m., NBC
Steven Seagal: Lawman, 10 & 10:30 p.m., A&E;
Top Chef: Just Desserts, 10 p.m., BRAVO
South Park, 10 p.m., COMEDY
Terriers, 10 p.m., FX
LA Ink, 10 p.m., TLC
Harry Loves Lisa, 10 p.m., TVLand
Ugly Americans, 10:30 p.m., COMEDY
NBA Basketball: Lakers v. Kings, Bucks v. Celtics
NCAA Football: Rutgers v. South Florida
What are you watching tonight?
Follow TV.com writer Stefanie Lee on Twitter: @StefAtTVDotCom