The Blacklist (10pm, NBC) - A search for the mole puts the entire FBI team under investigation, while a missing Red ( James Spader) targets the person who betrayed him. Also, a serial killer from Liz’s past strikes again. Alan Alda and Jane Alexander guest star.

Also on tonight . . .

Hart of Dixie (8pm, CW) - Lavon wants to stop a merger involving BlueBell and another town, so Zoe helps by distracting the residents with a scandal.

How I Met Your Mother (8pm, CBS) - In their ongoing “Slap Bet,” Marshall plans to land one final smashing blow to soon-to-be-married Barney.

Sleepy Hollow (9pm, Fox) - Capt. Irving’s daughter is targeted by evil forces, so he pleads for help from Crane and Mills, and also looks to Washington’s Bible for answers.

Major Crimes (9pm, TNT) - In the Season 2 finale, the squad inches closer to catching a menacing killer, and Rusty takes a brave stand while the team clashes with a morally challenged attorney.

Castle (10pm, ABC) - The investigation of a video-store clerk’s homicide reveals that the victim was a skilled hacker, and that Castle’s father is connected to the case.

Intelligence (10pm, CBS) - The CyberCom team investigate a suicide bombing at a U.S. Marine base, and Gabriel thinks he may have found his wife who has been missing for six years.