Tonight on TV

NFL football (6:30 p.m., ESPN); Chargers at Chiefs

How I Met Your Mother (7 p.m., Ch. 2): Ted finally reconnects with the girl in the pumpkin costume

Scared Shrekless (7 p.m., Ch. 4): The green ogre invites his friends to spend Halloween night in Lord Farquaad's haunted castle telling scary stories.

The Sing-Off (7 p.m., Ch. 5): The groups perform an opening medley of Halloween-themed songs.

Terra Nova (7 p.m., Ch. 13): Jim and Taylor investigate a murder in the colony.

2 Broke Girls (7:30 p.m., Ch. 2): Caroline takes Max to a cake-decorating class.

Dancing With the Stars (7:30 p.m., Ch. 4): The competition continues.

Two and a Half Men (8 p.m., Ch. 2): Jake has feelings for his chemistry tutor, but she has a crush on Walden.

Will Ferrell: The Mark Twain Prize (8 p.m., Ch. 7): The gala to honor the comic actor features Billie Joe Armstrong, Ed Asner, Jack Black, Matthew Broderick, Gwen Ifill, Adam McKay, Tim Meadows, Conan O'Brien, John C. Reilly, Paul Rudd, Andy Samberg, Molly Shannon and Ben Stiller.

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House (8 p.m., Ch. 13): Bridget worries when she can't get in touch with Gemma.

Mike & Molly (8:30 p.m., Ch. 2): Mike and Molly are invited to her boss' Halloween party.

Hawaii Five-0 (9 p.m., Ch. 2): Two young people filming a documentary about a Hawaiian burial site are murdered.

Castle (9 p.m., Ch. 4): Martha and Castle are held hostage by bank robbers.

Rock Center With Brian Williams (9 p.m., Ch. 5): Debut of this new news program. Tonight's stories include anti-government activists in Syria and a new airline boarding process.