Tonight, the networks are giving you a chance to catch up on a few of the week's premieres, plus a great marathon you should watch (if you can).

Homeland (Noon, Showtime) - If you have Showtime and didn't get to see the first season of their stunning Emmy-winning drama "Homeland," a marathon starts today at noon. All episodes air, concluding with the Season 1 finale at 11 p.m. Season 2 begins tomorrow night.

Vegas (8pm, CBS) - A repeat of Tuesday night's debut of a new fact-based crime drama starring Dennis Quaid as a 1960s Nevada lawman who clashes with Chicago mobsters running a Las Vegas casino. Not many people saw it Tuesday night and it's worth watching, so check it out. Also stars Michael Chiklis and Jason O'Mara.

Elementary (9pm, CBS) - A repeat of Thursday's pilot about Sherlock Holmes investigating crimes in modern-day New York City, as a consultant to the NYPD. Another good one you should check out if you missed it  earlier. Stars Jonny Lee Miller and Lucy Liu.

Lake Placid: The Final Chapter (9pm, Syfy) - A new sheriff has a big problem on her hands when a poacher unleashes the wrath of giant crocodiles in the fourth installment of this campy horror movie franchise.

Law & Order: SVU (9pm, NBC) - A repeat of the 2-hour 14th-season opener (really just two episodes back-to-back), which involves Capt. Cragen being arrested for murdering a prostitute.

Saturday Night Live (11:29, NBC) - Even SNL is a repeat tonight. It's last season's finale episode with Mick Jagger, Arcade Fire, Foo Fighters and Jeff Beck.

Last Hours in Suburbia (8pm, Lifetime) - In a new Lifetime movie, a teen tries to prove she is innocent of causing a car accident that killed her best friend.

Doctor Who (9pm, BBC America) - Millions of sinister black cubes fall from the sky, and the Doctor worries about an invasion of Earth.

Tanked (9pm, Animal Planet) - Brett and Wayde recall their most memorable aquarium-building experiences across the country.

Celebrity Ghost Stories (9pm, Bio) - Diane Neal, Debbie Allen, Kevin Sorbo and Debbie Matenopoulos tell of spooky encounters. Allen claims to have been visited by her deceased grandmother and Sorbo encounters the ghost of a dead bride.

The Incredible Dr. Pol (10pm, Nat Geo Wild) - Dr. Pol mistakes a bat for a banana peel and gets bitten. He takes the bat to get tested for rabies, and a positive result could endanger the health of the whole family. Meanwhile, Dr. Brenda has to perform surgery on a pup who may not survive. All in all, sounds like a barrel of laughs.

Saturday Night Live (11:35pm, NBC) - Joseph Gordon-Levitt hosts, with musical guest Mumford & Sons.

SNL Primetime Election Special (8pm, NBC) - With Jay Pharaoh's new Obama impersonation and Jason Sudeikis rocking the the Mitt Romney, this should be an interesting half hour.

Up All Night (8:30pm, NBC) - In the premiere of a retooled Season 2, "The Ava Show" gets canceled, putting a strain on Ava and Reagan's relationship. Meanwhile, Chris decides to go back to work, and Reagan hires her brother to help remodel a bathroom.

The Office (9pm, NBC) - In the ninth and final season opener, two young employees arrive at the office and staffers immediately label them the new versions of Jim and Dwight. Also, Oscar mulls adopting Angela's cat and Kevin saves a turtle. As bad as this show had gotten over the past season or two, I still think this final run will be worth watching.

Project Runway (9pm, Lifetime) - The designers visit Radio City Music Hall and create  costumes for the legendary Rockettes. Debra Messing is the guest judge.

Parks and Recreation (9:30pm, NBC) - Leslie and Andy visit Ben and April in Washington, D.C., in tonight's Season 5 opener. Sens. John McCain, Barbara Boxer and Olympia Stowe have cameos (McCain's appearance is especially funny). Back in Pawnee, Ron hosts a barbecue for the P&R staff. I won't win any popularity contests for saying this, but Ron's "meat lover" shtick is starting to feel old to me. Ditto for whatever it is that Rob Lowe is doing. Still love the show, though!

Don't Divorce Me! Kids' Rules for Parents on Divorce (9:30pm, HBO) - Children talk about divorce and offer advice for parents to make sure kids are not manipulated, forgotten or mistreated when the time for permanent separation comes.

Wilfred (10pm, FX) - In the second season finale, existential questions are posed to Wilfred and Ryan.

Awkward (10:30pm, FX) - In the Season 2 finale, Jenna prepares for her trip to Europe as her decision about the boys goes public.

Aladdin and the Death Lamp (7pm, Syfy) - In this Syfy movie, Aladdin fights a malicious genie who wants to control the world. I'm assuming there's a two-headed sharktopus involved, also. Kandyse McClure ("Battlestar Galactica") and Noam Jenkins (RIP Jerry on "Rookie Blue") star.

Celebrating the Music of Johnny Cash: We Walk the Line (8pm, UNC-TV) - A concert honoring Johnny Cash featuring performances by Willie Nelson, Kris Kristofferson, Sheryl Crow, Ronnie Dunn, Lucinda Williams, Shooter Jennings and others.

Tanked (9pm, Animal Planet) - Neil Patrick Harris ("How I Met Your Mother") requests a tank to honor escape artist Harry Houdini at the Magic Castle in Los Angeles. Meanwhile, in Las Vegas, Wayde makes plans for his 15th wedding anniversary.

Pegasus vs. Chimera (9pm, Syfy) - Flying, magical steed Pegasus squares off against the hellish, shape-changing Chimera. Sebastian Roche ("Fringe") and Rae Dawn Chong ("Commando") star.

Saturday Night Live (11:35, NBC) - Season 38 opens with host Seth MacFarlane and music guest Frank Ocean.

America's Got Talent (8pm, NBC) - NBC is repeating this week's premiere, which features new judge Howard Stern. Howie Mandel and Sharon Osbourne return as judges, and Nick Cannon is back as host. This first episode features auditions in St. Louis and Los Angeles.

Saw Dogs (9pm, Discovery) - You can get your fix of chainsaw-sculpting with tonight's "Saw Dogs" marathon. Some of the creations featured in tonight's episodes are a mother whale and her baby, a massive tree house, and a soaring eagle for a golf course.

American Warships (9pm, Syfy) - The crew of the USS Iowa take on a fleet of hostile alien spaceships. This is a movie, by the way.

Saturday Night Live (11:29pm, NBC) - Mick Jagger pulls double duty on SNL's 37th season finale, hosting and providing the music. Jagger is scheduled to perform without his fellow Stones, so don't expect to see Keith Richards tonight. Jagger is pictured here in a 2001 "Saturday Night Live" skit with Jimmy Fallon.

Shark Men (8pm, NGC) - The crew hope to catch one more tiger shark and three more silvertip sharks before pulling anchor and leaving the Revillagigedos Archipelago. 

Welcome to Sweetie Pie's (9pm, OWN) - Robbie must run the business by herself because Tim is distracted by his show-business endeavors. But she does persuade him to help judge auditions for the Upper Crust, and he finds one performance surprisingly charming. 

Tanked (9pm, Animal Planet) - The crew discuss their favorite tanks and pranks from Season 1 in an episode that features unseen footage. 

Lockup: Santa Rosa - Extended Stay (10pm, MSNBC) - An inmate dies; a murderer explains prison life, which a young inmate learns about firsthand; and another inmate mails a death threat to the White House. 

Saturday Night Live (11:29pm, NBC) - Will Ferrell is the guest host with musical guest Usher. 

Rock and Roll Hall of Fame Induction Ceremony (9pm, HBO) - HBO is dedicating tonight's broadcast of the Rock and Roll Hall of Fame Induction Ceremony to Adam "MCA" Yauch, the Beastie Boy who died on Friday after a three-year battle with cancer. The Beastie Boys were inducted into the Hall of Fame on April 14, but Yauch was too ill to attend. Adam "Ad-Rock" Horovitz read a letter from Yauch at the ceremony. Billboard reports that HBO has altered the broadcast to include an acknowledgment of Yauch's passing and tributes to Dick Clark and Levon Helm, who also died after the ceremony. Other inductees this year include Donovan, Small Faces/The Faces, Red Hot Chili Peppers, Guns N' Roses, Freddie King and others. Taped at Cleveland's Public Auditorium.

My Ghost Story: Caught on Camera (9pm, Bio) - Two men encounter the ghosts of people killed in a train derailment; the ghost of a dead cook is seen by a Pennsylvania woman; Native American ghosts haunt a Kentucky cave; and a married couple befriend the spirits of sailors who served on the USS North Carolina. 

Tanked (9pm, Animal Planet) - A baseball team in Pensacola, Fla., asks for a tank inside a school bus and Brett designs an aquarium resembling a bottle of nail polish—complete with hand driers—for his mom's salon. 

Saturday Night Live (11:29, NBC) - Guest host Eli Manning and musical guest Rihanna.

Titanic (8pm, ABC) - The three-hour opener of a new miniseries that uses real and fictional characters to dramatize the events leading up to the luxury liner's sinking in 1912. Tonight, tension between First and Second Class passengers, and a Catholic engineer from Belfast looks forward to his new life in America. This is from Julian Fellowes, the creator of "Downton Abbey." Fellowes gives his upstairs-downstairs treatment to the Titanic story, but the buzz isn't as strong as it was for "Downton." But -- it has Linus Roache (right)! The one-hour conclusion airs tomorrow night at 9.

Must Love Cats (8pm, Animal Planet) - In the season finale, John Fulton visits a kindergarten for kittens (awww!) and cats that help prison inmates.

The Firm (9pm, NBC) - Another random episode of "The Firm!" Mitch and Ray meet with Andrew, who offers to help expose Kinross and Clark to the FBI. Meanwhile, Abby tries to prevent the next murder, and Mitch prepares to take on Kevin Stack. If my math is correct, two more episodes after this one.

Tanked (9pm, Animal Planet) - Season 2 opens with Wayde and Brett visiting a familiar client in New York to install a shark tank in an orthodontist office.

A Night to Remember (10pm, TCM) - This 1958 classic film based on the book by Walter Lord recreates the sinking of the Titanic.

Saturday Night Live (11:29pm, NBC) - Josh Brolin hosts and the music guest is Gotye.

To Kill A Mockingbird (8pm, USA) - A special introduction from President Obama marks the 50th anniversary of this Oscar-winning classic film, which was adapted from Harper Lee's Pulitzer Prize-winning novel. In the film, Gregory Peck plays Atticus Finch, a small town lawyer who defends a black man wrongly accused of raping a white woman in 1930s Alabama. Robert Duvall made his screen debut in this film, as the mysterious Boo Radley. In other words, YOU SHOULD WATCH THIS, even if you've seen it before. The President also introduced the film at a special White House screening on Thursday, at which Washington, D.C., schoolchildren and the widow of Gregory Peck were in attendance.

iCarly (8pm, Nickelodeon) - Carly gets sick and transmits her illness to a member of the British pop group, One Direction (who also perform tonight on SNL).

Must Love Cats (8pm, Animal Planet) - John Fulton visits an Oregon woman who taught her cats how to swim and a cat hotel in Los Angeles.

Saturday Night Live (11:29pm, NBC) - Sofia Vergara from "Modern Family" hosts and the music guest is One Direction.

Live from the Artists Den (1am, UNC-TV) - The Fray perform at the Angel Orensanz Foundation in New York City's Lower East Side.

The ACC Tournament (1pm, WRAL) - Games scheduled for today at 1 p.m. and 3 p.m.

Must Love Cats (8pm, Animal Planet) - Hello, Kitty. A new season of "Must Love Cats" opens with host John Fulton exploring the cat culture in Japan. Featured: Tama, the train station master cat (right); the Maneki Neko, or "Beckoning Cat;" Tashirojima (aka Cat Island); and a shelter for rescued cats, including ones left behind after the 2011 earthquake and tsunami. An episode of "Too Cute" about something called "kitten dolls" airs at 9 and a different "Too Cute" about cats repeats at 10.

Of Two Minds (8pm, Lifetime) - A woman takes her schizophrenic sister to live with her family after her mother dies, but her sibling's disturbing behavior threatens their relationship.

Q Viva! The Chosen (8pm, Fox) - Two couples who dance the tango face a hard decision, and Marc Anthony embraces the Mexican pointy-boots trend.

Game Change (9pm, HBO) - This movie adaptation of the political best-seller by Mark Halperin and John Heilemann focuses on the John McCain-Sarah Palin storyline of the 2008 presidential campaign. Stars Ed Harris as McCain and Julianne Moore as Palin. Adrienne has a "Game Change" review.

The Firm (9pm, NBC) - Penultimate episode alert! Tonight, Mitch defends a woman accused of kidnapping a baby, Ray and Tammy find information on the Sarah Holt case, and Joey Morolto admits to being the head of the crime family.

Saturday Night Live (11:29pm, NBC) - Jonah Hill hosts with music guest The Shins.