What's On TV Tonight? - 4/19/2013

Credit: NBC

8:00 PM ET

Happy Endings ("The Ballad of Lon Sarofsky") - Penny's friends are shocked when she has an affair with the Car Czar (Rob Corddry); Max enters a pageant with Dave and Alex as his coaches. (ABC)

Fashion Star ("Night Out on the Town") - The contestants must design garments for a big night out; the contestants are paired up to design a photo shoot. (NBC)

Nikita ("Broken Home") - Nikita is strapped down, drugged and subjected to Amanda's mental conditioning process; Alex tries to save everyone as violence escalates; Owen's memories drive him to disturbing actions. (The CW)

Playing With Fire ("Give It Up for the Loser!") - Derek and Daniel go head-to-head in a boxing fight; an old friend visits Jennifer; Julie gets a life changing call. (E!)

Four Weddings: Unveiled ("...and a Rally Towel") - Shannon's son is the focus of the vows at her wedding; Medina shares interfaith traditions; Amanda and her husband are cheered into their reception with rally towels; Andrea has a special father-daughter dance. (TLC)

Sons of Guns ("Loaded Up") - Will, Steph and Kris head to Vegas to demo the Desert AR; Red Jacket loses a valued member. (Discovery)

8:30 PM ET

Happy Endings ("Un-sabotagable") - Max asks Jane to help him get his act together so he can prove that his life is not pathetic; Alex tries to use a stockpile of coupons. (ABC)

9:00 PM ET

NICK'S PICK: Grimm ("Ring of Fire") - Nick tries to suppress a volcano's threat to Portland; Adalind meets a new ally in Europe; many simultaneous memories of Nick overwhelm Juliette. (NBC)

Vegas ("Scoundrels") - When a bruised Violet accuses Dixon of assault, Katherine places him under arrest; Lena finds a dead gambler in one of Savoy's suites. (CBS)

Da Vinci's Demons ("The Serpent") - Leonardo continues his quest for the Book of Leaves; the pope's nephew arrives; the failure of Leonardo's war designs causes a rift with the Medicis; the pope learns of Leonardo's talents. (Starz)

Shark Tank - Two women pitch their military-inspired jewelry line; traditional British scone; custom furniture; door-to-door luggage pickup service; update on the Scrub Daddy cleaning tool. (ABC)

Live From Lincoln Center ("Celebration: Stephanie Blythe Meets Kate Smith") - Mezzo-soprano Stephanie Blythe performs works made famous by Kate Smith during World War II. (PBS)

Sons of Guns [SEASON PREMIERE] ("Under Siege") - A blacklisted customer shows up in the middle of a violent storm; the mishandling of an important order wreaks havoc on the shop. (Discovery)

Say Yes to the Dress: Atlanta ("Hope on a Hanger") - Meredith is looking for her dream wedding dress to carry her through her upcoming cancer treatments; Kelly's N.Y. mom and southern mother-in-law have different opinions of what Kelly should wear on her big day. (TLC)

9:30 PM ET

Say Yes to the Dress: Atlanta ("No to the Bow") - Kayla wants to please her mom while shopping for a dress; Danielle wants a lace gown for her big day but her Dad is against it; in her fitting, Whitney hopes her dress will live up to her mom's high standards. (TLC)

10:00 PM ET

20/20 ("In an Instant") - The latest news on the Boston Marathon bombings; split-seconds decisions during highway pile-ups; survivors of workplace shootings; stampedes; amputee athlete Bree McMahon visits victims of the Boston tragedy. (ABC)

Rock Center With Brian Williams - The Boston bombing; author Jackie Hance; news from the week. (NBC)

Anderson Cooper Special Report ("Terror at the Marathon") - Inspiring stories of loss, survival and heroism of the bombing of the 2013 Boston Marathon. (CNN)

Blade Brothers [SERIES PREMIERE] ("Monster Claw") - Todd Begg teams up with his two brothers to design high-end custom blades for the knife industry. (Discovery)

Fashion Police - Guest host Jaime Pressly. (E!)

Mystery Diners [SEASON PREMIERE] ("Dining in the Dark") - After receiving complaints, the owner of Catharsis finds out employees have created a game where they mess with blindfolded customers. (Food Network)

Out There ("Ace's Wild") - Chad's classroom doodles draw the attention of the cool kid yearbook staff, who invites him to join their inner circle; Chad and Chris enjoy their popular status until Chad discovers their new friends have ulterior motives. (IFC)

XIII ("Tempest") - In a race against the brutal Synequanon security team, XIII tracks down a scientist, a prisoner of the corporation who has a special connection to the mysterious letters. (REELZ)

I Found the Gown [SEASON PREMIERE] ("Family Knockdowns and Dress Knockouts") - Velvet battles with her pattern-maker aunt; Ailda wants a sexy gown; Carolyn is looking for a Vera Wang dream dress. (TLC)

Real Time With Bill Maher - Guests include Brian Levin, Dan Neil, Amy Holmes, Nicholas Kristof and Salman Rushdie. (HBO)

10:30 PM ET

I Found the Gown ("What's Old Might be New") - Windsor wants a better deal; Sarah would like an inexpensive dress she can add pieces of her mother's gown to; Kim refuses to wear white on her big day. (TLC)

Blade Brothers ("Grim Cleaver") - Todd is commissioned to create a blade that's a combination of a meat cleaver and the Grim Reaper's deadly scythe. (Discovery)

11:00 PM ET

VICE ("Guns & Ammo") - Students at the New Life Baptist Church & Academy in Albuquerque, N.M. are taught gun drills and tactics to disarm attackers; toxic military waste is left behind in Iraq. (HBO)

Zane's the Jump Off ("Playing the Field") - Dmitri fantasizes about Lauren while he is with Brenda; Woody mixes business with pleasure; Gabriel has suspicions about his wife's best friend. (Cinemax)

Late Night

The Late Late Show With Craig Ferguson welcomes Actor Harrison Ford; actress Melissa Rauch. (12:35 AM, CBS)