CHAOS (8pm, CBS) - The agents go against orders to capture an arms dealer, but their actions trouble Rick, who must decide whether to report their unauthorized activities to the CIA director.

Cops (8pm, Fox) - In the 23rd season finale, police in Sacramento County, California, look for a parole who may be armed. Cops in Palm Beach County, Florida, and Pierce County, Washington, are also featured.

Rock the House (9pm, Hallmark) - A busy lawyer (Jack Coleman) struggles to make time for his teen daughter (Cassi Thomson) and their relationship suffers. But when the man reconnects with his high school band-mates, he sees positive changes in everyone.

2010: Moby Dick (9pm, Syfy) - Herman Melville's classic is retold with the modern-day captain of a submarine hunting the massive whale that once disfigured him in a terrifying confrontation.

America's Most Wanted (9pm, Fox) - Season 24 closes with the search for a child predator in South America. This show will not return as a regular series. At best, look for occasional specials on Fox.

Independent Lens: Two Spirits (11pm, UNC-MX) - A documentary about Fred Martinez, who became one of the youngest hate-crime victims in modern history when he was brutally murdered at 16. The film explores the life and death of a gay Navajo boy who was also a girl, and the essentially spiritual nature of gender.

This month marks the 50th anniversary of a landmark moment in this country's civil right era, the 1961 Freedom Rides, during which more than 400 Americans traveled through the South on buses to challenge Jim Crow laws.

"Freedom Riders" (UNC-TV, 9 tonight) recounts this story, powerfully, retracing each arduous, inspirational, painful ,and ultimately successful step  on a journey that tested the notion of non-violent activism.

The documentary isn't always easy to watch, mostly because those interviewed have such vivid memories of what they experienced, what they lived through. Thus, the hatred, the fear, the courage, the determination, the moments of clarity and triumph feel so present. That also makes it a must watch.

Music often provides the soundtrack to our lives, but in "Soundtrack for a Revolution" (UNC-TV, 9 tonight), music was a sustaining force during the civil rights struggle.

Through interviews and archival footage, the 2009 documentary shows how the non-violent protesters used music -- most mined from slavery and the black church -- to say the things they couldn't say, get through the worse moments, and elevate their spirits during the imprisonments, violence and triumphs during the civil rights movement.

Some of the most pivotal songs are re-interpreted by modern acts ranging from North Carolina's Anthony Hamilton to legendary folk singer Richie Havens to Brit soul singer Joss Stone.

Community (8pm, NBC) - In the first part of the show's two-part season finale, the students play paintball during a campus picnic. But the competition quickly becomes heated and the emergence of a mysterious man (Josh Holloway, aka Sawyer from 'Lost') signals a change in the game.

American Idol (8pm, Fox) - Someone is eliminated, but not before judge Jennifer Lopez, rapper Pitbull, and country group Lady Antebellum all perform.

Parks and Recreation (9pm, NBC) - Leslie's ex-best friend (Parker Posey) launches an attack on Pawnee, banning residents from visiting a nearby park in the neighboring city of Eagleton.

Thoroughbred (9:30pm, UNC-TV) - A documentary that explores the world of thoroughbred horses during the year leading up to the 2009 Kentucky Derby. Features looks at grooms, jockeys, trainers, owners, and breeders.

30 Rock (10pm, NBC) - In the Season 5 finale, the 'TGS' gang are ready for summer vacation. Liz lands in the Hamptons for rest and relaxation, but then Tracy moves in next door. Also, lonely Jack latches onto Kenneth for company.

Running Wilde (10pm, FX) - Do you miss Will Arnett's canceled Fox sitcom 'Running Wilde?' Me neither. But they're showing the last unaired episodes anyway -- on FX every Thursday night at 10pm. They actually started last week, but if you missed that one, looks like it's repeating at 10:30 right after tonight's episode -- in which Emmy gets Migo involved when she champions immigrant rights, and this tests Migo's loyalty to Steve.

Hollywood at Home (8pm, HGTV) - Celebrities offer tours of their homes and discuss their personal style. Featured: John Leguizamo, Lara Spencer, Trace Adkins, Evan Lysacek, Paul Shaffer, and Lisa Ling.

The Royal Wedding: The Encore and More (8pm, TLC) - If you were trapped in a mine for the past 36 hours, you can watch memorable moments from the wedding of Prince William and Kate Middleton. Includes interviews with guests who attended the wedding.

White House Correspondents Dinner (9pm, MSNBC, CSPAN) - Seth Meyers (right, 'Saturday Night Live') headlines the event, which usually features a comedic turn by the president. Journalists are also honored for their work and 18 Washington, D.C. students will receive college scholarships.

Marwencol (11pm, UNC-TV) - An Independent Lens documentary about Mark Hogancamp, a man who seeks recovery in Marwencol -- an incredible 1/6th scale World War II-era town he creates in his backyard -- after a vicious attack leaves him brain damaged and broke. Read more about Hogancamp and Marwencol at the Independent Lens site.

Dancing with the Stars (8pm, ABC) - The celebrities dance to songs that are considered guilty pleasures. Is that code for "bad?"

Restrepo: Outpost Afghanistan (9pm, National Geographic Channel) - An encore airing of the award-winning documentary by Sebastian Junger and photographer Tim Hetherington. Hetherington was killed in Libya last week, along with fellow war photographer and NC State alum Chris Hondros. For 'Restrepo,' Junger and Hetherington visit Afghanistan's Korengal Valley and spend a year with the Second Platoon, a squadron that dubbed their stronghold Outpost Restrepo in honor of their fallen comrade PFC Juan Restrepo. An Al Quaeda and Taliban stronghold, Korengal Valley sees some of the fiercest fighting in the country.

American Experience: Stonewall Uprising (9pm, UNC-TV) - A documentary about the 1969 police raid on a popular gay bar in Greenwich Village that erupted into violent protests and demonstrations that lasted for six days. The Stonewall Riots, as they came to be known, marked a major turning point in the modern gay civil rights movement.

The Event (9pm, NBC) - Peel and Sterling investigate a sudden illness in the White House. Also Michael helps Leila and Sean and Vicky try to prevent Sophia's weapon from being loaded onto a Russian plane headed for the U.S.

Better With You (9:30pm, ABC) - To prep for their wedding reception, Casey and Mia take a dance class and Casey, who is a very good dancer, discovers that Mia is not. Meanwhile, Ben seeks relationship advice from Larry King, who appears as himself.

Seized and Sold: The Madoff Auction (10pm, National Geographic Channel) - A look at items seized from Ponzi schemer Bernie Madoff's New York homes as they're auctioned off by the U.S. Marshall's Service to raise funds for victims of white collar crimes. Items up for bid include a $350,000 ring and an antique Steinway piano.

The PBS Kids Go! series 'Arthur' is helping kids get into Earth Day today with the launch of five brand new episodes about environmental protection, cultural awareness, and teamwork. 

The first episode airing is "Buster Baxter and the Letter from the Sea." In this episode, Buster discovers a message in a bottle on the beach while on vacation with the Read family and begins sending his own messages by throwing bottles into the ocean. Buster and Arthur ultimately learn that keeping the beaches and waterways clean is the real message.

UNC-TV is joining WRAL's Here to Help Disaster Relief Telethon, which will simulcast on both stations Wednesday, April 20, from 7 to 8 p.m.

The telethon will raise money to help North Carolinians devastated by Saturday's tornadoes. In addition to the evening telethon, phone lines will be open from 6 a.m. to 8 p.m. on Wednesday (call 1-800-424-9725) and donations can also be made securely online.

All money donated will fund relief missions now underway by the Triangle Red Cross, Samaritan’s Purse, the North Carolina Baptist Men’s Association and the Salvation Army of Wake County.

Programming note: 'Nightly Business Reoprt,' which usually airs on UNC-TV at 7 p.m., will air at 1:30 a.m. instead.

Frontline offers another powerful investigation with "The Silence" (UNC-TV, 9 tonight), an examination of sexual abuse in the Catholic church.

It's a tough half-hour report showing the devastation left behind when three men who worked for the church along Alaska's far west coast in the late 1960s and early 1970s abused boys and girls, 80 percent of those who lived in the parish, pretty much an entire generation.

The abuse went on for years, leaving adults who grew up battling drugs and alcohol, but mostly fighting shame and anger.