Circus (9pm, UNC-TV) - A look at the life in the circus through the prism of the Big Apple Circus opens with "First of May," in which the entertainers and crew map out a new show for a 350-performance tour. "One Ring Family" continues at 10pm with tensions at the first dress rehearsal.
Law & Order: SVU (9pm, NBC) - An environmentalist's body is found at an industrial laundry plant, and the investigation puts Benson and Stabler in danger. When more victims are discovered, Benson unexpectedly reflects on her past while bonding with a victim's daughter, played by Maria Bello.
Modern Family (9pm, ABC) - All of the ABC comedies look good tonight, but on "Modern Family," Phil is perplexed by a faulty smoke detector, Gloria and Manny pay a surprise visit to Jay at work, and Cameron tries to get Lily in a commercial.
Terriers (10pm, FX) - Listen up. "Terriers" is not about dogs. It's a great show about private detective buddies that you should all be watching. Tonight, as Gretchen's wedding nears, Hank learns some troubling information about her fiance. Also, Britt tracks down the hooker (D.J. "Shangela" Pierce) who ripped of a teenage boy. Britt also begins to suspect that Katie's odd behavior means that she's pregnant.
The Defenders (10pm, CBS) - When a Las Vegas entertainment icon is suffocated to death in his mansion and his girlfriend is charged with the crime, Pete reluctantly agrees to represent her.
In the Spotlight with Robin Roberts: All Access Nashville (10pm, ABC) - Robin Roberts interviews Brad Paisley, Carrie Underwood, LeAnn Rimes, and Miranda Lambert. And yes, ABC is air ing the CMA awards next week.