(ALL TIMES ET)

10PM | ABC
Castle – Entertainment Weekly‘s “Geek God” cover boy Nathan Fillion revisits his soap opera roots as his Castle helps investigate the murder of a soap writer. The main suspects: the soap’s super competitive stars. Corbin Bernsen (whose real-life mom is The Young and the Restless diva Jeanne Cooper) and Jane Seymour guest star.

8PM | NBC
Chuck – While Chuck and the team are trying to figure out who murdered a spy on their home turf, Morgan is busy trying to maneuver a Buy More war with Large Mart.

8PM | ABC – 12TH SEASON PREMIERE
Dancing With the Stars – Go Karate Kid and Sugar Ray Leonard!

8PM | FOX
House – Cuddy tells Wilson she feels guilty for dumping his BFF.

8PM | CBS
How I Met Your Mother – In the awesomely titled “Lengendaddy,” Barney finally meets his real papa (guest star John Lithgow).

8PM | ABC FAMILY – 1ST SEASON FINALE
Pretty Little Liars – Season two kicks off in June, but that’s still gonna seem like a long time after tonight’s delicious cliffhanger season one finale, as the pals go to a surprising source for help in stopping A.

9PM | HBO
Triangle: Remembering the Fire – HBO’s compelling doc chronicles the 1911 fire at New York City’s Triangle Shirtwaist Factory, which killed more than 100 women (mostly poor immigrants) and brought about some much-needed improvements in workplace safety.

10PM | BRAVO
Bethenny Ever After – Gina, um, tricks Bethenny and Jason into baptizing baby Bryn.

10PM | MTV – 1ST SEASON FINALE
Skins – The controversial show that failed to make much of a splash with anyone except the advertisers who bailed on it wraps its first season as Tony asks his friends to help him find his sister.

Worth flipping to during commercials:
– Josh gets abducted on Being Human (9PM, Syfy);
– Buddy and the crew make a cake for WrestleMania on Cake Boss (9PM, TLC);
– Adam Arkin guest stars on The Chicago Code (9PM, Fox);
– Martinez confronts Jarvis on The Event (9PM, NBC);
– The four-episode block of It’s Always Sunny in Philadelphia (9PM, Comedy Central) includes the gems “The Gang Buys a Boat” and “Dennis Gets Divorced”;
– Richard Kind guest stars as an old boyfriend who needs Harry’s help in an armed robbery case on Harry’s Law (10PM, NBC);
– The Five-O has to investigate the murder of a comic book geek who was given truth serum before being killed on Hawaii Five-O (10PM, CBS);
– On Heavy (10PM, A&E), a man who weighs more than 500 pounds tries to improve his health before the birth of his first child;
– Jody Whatley and Carmen Electra are the judges as the contestants have to record a tune and perform it live on RuPaul’s Drag Race (10PM, Logo).

And the late-night line-up:
– Conan (11PM, TBS): Sarah Silverman;
– The Daily Show with Jon Stewart (11PM, Comedy Central): Author Sarah Vowell;
– The Colbert Report (11:30PM, Comedy Central): Steve Martin and the Steep Canyon Rangers;
– The Late Show with David Letterman (11:35PM, CBS): Dana Carvey;
– The Tonight Show with Jay Leno (11:35PM, NBC): Zachary Levi and Lisa Lampanelli;
– Lopez Tonight (Midnight, TBS): Mike Tyson;
– Jimmy Kimmel Live (12:05AM, ABC): Mark Cuban and Liv Tyler;
– Late Night with Jimmy Fallon (12:35AM, NBC): Kiefer Sutherland;
– The Late Late Show with Craig Ferguson (12:37AM, CBS): Denis Leary;
– Last Call with Carson Daly (1:35AM, NBC): Tom Shadyac (REPEAT).

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• Filed in Chuck, It's Always Sunny in Philadelphia, Late Night, TV Picks
• Tags: Bethenny Ever After, Castle, Chuck, Dancing With the Stars, House, How I Met Your Mother, Pretty Little Liars season finale, Skins, Triangle: Remembering the Fire HBO