What's New Tonight: Monday, May 6th.

What's New Tonight: Monday, May 6th. 8:00 PM EST:

How I Met Your Mother” on CBS. Robin is having trouble locating “something old” that she buried in Central Park for her wedding. Marshall and Lily enlist Ted’s help in packing for Italy. Barney spends some quality time with Robin Sr.

Dancing with the Stars” on ABC. Week 8 of performance. Each couple will perform two dances, including a minute and trio.

The Voice” on NBC. The Top 16 begin their play-offs.

9:00 PM EST:

2 Broke Girls” on CBS. When a former employee threatens to defame Caroline’s father in a book, he asks Caroline to go on a talk show to defend his honor.

 “Defiance” on SyFy. Kenya is kidnapped. Rafe is closer to solving the mystery of his son’s death.

10:00 PM EST:

Bates Motel” on A&E. Dylan goes on a road trip, Norma has an encounter with a mysterious stranger, and Bradley gets annoyed by the rumors at school.

Castle” on ABC. A man is killed and the crime scene is taken over by Homeland Security. Castle and Beckett learn that the cause of death was not a car bomb, but a missile from a military drone.

Hawaii Five-0” on CBS. A kidnapping victim’s body is discovered. Five-0 is on the case. Kono asks Catherine for a favor that could hurt Kono’s relationship with Adam.

Revolution” on NBC. Miles and Neville find themselves fighting for the same cause. Charlie, Jason, and Nora put themselves in danger in order to prevent Monroe from obtaining anthrax. Rachel and Aaron are captured.

Warehouse 13” on Syfy. Artie still has some hurdles to jump before he can return to work. Claudia and Pete investigate a murder involving a radical environmental group.