Nova: Deadliest Tornadoes (9pm, UNC-TV) - A look at the science behind the April 2011 tornado outbreak in the U.S., which saw more than 360 people killed from hundreds of twisters.

Modern Family (9pm, ABC) - All ABC comedies are back tonight. It's election day on "Modern Family," so the Dunphys are all campaigning and Claire has technical problems during last-minute interviews. Be sure to stay tuned for ...

Don't Trust the B---- in Apartment 23 (9:30pm, ABC) - A very funny new sitcom about an optimistic girl from the midwest who moves to New York and finds herself a roommates who "has the morals of a pirate." The best part (and there are many wonderful parts) is the evil roomie's best friend is James Van Der Beek, playing himself. Check out my review.

Law & Order: SVU (10pm, NBC) - A closed rape case of Benson's is reopened because of its similarities to a new case, and the possibility of wrongful imprisonment surfaces. As Benson's work is questioned, tension develops between her, ADA Haden and Bayard Ellis.

CSI (10pm, CBS) - A man Nick helped  put in prison gets his conviction overturned and will be released, unless the CSIs can uncover new evidence to prove he is guilty.

Psych (10pm, USA) - In the Season 6 finale, Gus and Henry reopen a murder investigation when the victim's body finally surfaces after 20 years.  

Revenge (10pm, ABC) - There's no new "Revenge" tonight, but there is a recap special.

One Tree Hill (8pm, CW) - In the emotional series finale, the 10th anniversary of Tric is celebrated, and some former Tree Hill residents return for the festivities. "One Tree Hill" ran for nine seasons and was filmed in Wilmington. Pictured here, Austin Nichols as Julian and Sophia Bush as Brooke.

Best Friends Forever (8:30pm, NBC) - In the pilot of another throwaway NBC sitcom (see "Bent" below), a woman moves back to Brooklyn and in with her best friend after being served with divorce papers.

Bent (9pm, NBC) - The final two episodes of this great but under-appreciated sitcom air tonight. In the first, Alex fears Pete's slacker ways are resurfacing and Screwsie has Gary pet sit her boss's difficult cat. In the second episode, Alex dreams about Pete while on vacation with Ben, causing her to reexamine her feelings, and Walk gets ready to make his latest theater debut.

Happy Endings (9:30pm, ABC) - For the third week in a row, everything on ABC tonight is a repeat except for this gem, which has its second season finale. The gang attend another wedding and Penny is upset about not having a date, and Brad has a tough time breaking important news to Jane. Also, Max tries to muster the courage to hit the stage with his old all-male Madonna cover band.

CSI (10pm, CBS) - A man is gunned down in a casino at point-blank range and the CSIs shut down the building to find the killer.

Nature: Ocean Giants (8pm, UNC-TV) - A three-hour special on the underwater world of whales and dolphins. Included, the human-like qualities of the animals and their reliance on sound underwater.

American Idol (8pm, Fox) - Contestants have one last chance to win over the judges before the first group of semifinalists are revealed.

Raising Renee (8pm, HBO) - NCCU professor Beverly McIver tells her story of caring for her mentally disabled sister. Adrienne's review.

Modern Family (9pm, ABC) - Gloria learns a secret that Claire has been hiding, and one of Jay's proudest golf moments is ruined by Mitchell.

Happy Endings (9:30pm, ABC) - The end of winter signals  "Spring Smackdown," when Jane (Eliza Coupe, right) and Brad (Damon Wayans Jr., right) have their annual domestic dispute.

Royal Pains (10pm, USA) - Hank struggles to accept Jack's illness in the Season 3 finale, and Evan joins Boris' cousin to look into an experimental treatment.

American Weed (10pm, National Geographic Channel) - A new short series that takes an in-depth look at Colorado's medical marijuana industry. Tonight's episode profiles Fort Collins dispensary owners who face the possibility of having their businesses shut down should voters approve Proposition 300.

CSI (10pm, CBS) - The CSIs investigate when a house is stolen from its foundation. Also, Julie displays her skills in blood analysis.

Note: No new "Revenge" tonight.

Survivor: One World (8pm, CBS) - The 24th edition of "Survivor" will have two tribes (men versus women) but living together in a single camp on a Samoan beach.

Oprah's Oscar Special (9pm, OWN) - Oprah interviews 2012 Oscar nominees Viola Davis and Octavia Spencer from "The Help" and Jonah Hill from "Moneyball."

Happy Endings (9:30pm, ABC) - Max's new boyfriend (James Wolk) is a hit with everyone, except for Dave, who sets out to prove he is equally cool. Meanwhile, Max worries he's not good enough for his "perfect" guy.

CSI (10pm, CBS) - Elizabeth Shue (left with George Eads) joins the cast as Russell's former colleague, who helps him investigate the death of a man's ex-girlfriend.

Revenge (10pm, ABC) - People close to Emily are in jeopardy when unexpected turmoil breaks out at her engagement party. Meanwhile, Jack searches for Amanda.

Royal Pains (10pm, USA) -  Jack's illness finally takes a toll on him, and Hank offers his support during the tough time. Elsewhere, Boris' cousin asks Evan for help repairing her relationship with Boris and Evan tries to help Divya fix a financial problem.

Nova: Mystery of a Masterpiece (9pm, UNC-TV) - Nova examines the work of art sleuths who tackle "cold case" art mysteries as well as the criminal market in stolen and fraudulent art. Includes a look at image analysis which reveals a portrait purchased for $20,000 to be a lost work of Leonardo da Vinci, which revalues the painting at $100 million.

Criminal Minds (9pm, CBS) - A serial rapist in Houston known as "The Piano Man" resurfaces and assaults his previous victims. Meanwhile, Prentiss deals with the trauma of rejoining the team.

Touch (9pm, Fox) - The debut of a new drama in which a blue-collar New York widower (Kiefer Sutherland) gets help from a social worker and an educator in an attempt to bond with his emotionally troubled son, whose obsession with numbers appears to enable him to predict the future. Adrienne has a review.

CSI (10pm, CBS) - Catherine (Marg Helgenberger, right) makes the painful decision to leave CSI. This is the final episode for Helgenberger, who has been on the show for 12 seasons. She hasn't ruled out returning for an occasional guest spot.

Royal Pains (10pm, USA) - Members of a rock band become ill, forcing Hank and Divya to figure out the cause, but the prescription debacle puts a strain on their working relationship.

Hot in Cleveland (10pm, TV Land) - Victoria's daughter arrives for a visit with the news that she and Melanie's son are engaged. Meanwhile, Joy's blind boyfriend thinks she's 26 and Elka prank-calls the New York Yankees third baseman.

Work of Art (9pm, Bravo) - The artists visit an idyllic small town in New York's Hudson Valley and then must create a portrait of a resident. The guest judge is Richard Phillips.

Barbara Walters 10 Most Fascinating People (9:31pm, ABC) - Who does Barbara Walters find fascinating? The Kardashians, Donald Trump, Simon Cowell, and Katy Perry (left), to name a few. And probably not much suspense as to who her secret #1 pick will likely be (cough Gabby Giffords cough). (UPDATE: When I'm wrong, I admit it. Walters picked Steve Jobs as the most fascinating man of the year.)

Psych (10pm, USA) - Shawn and Juliet's romantic getaway doesn't go as planned when their hotel room is robbed and a body turns up at a nearby winery.

American Horror Story (10pm, FX) - Vivien has her mysterious little anti-Christ devil babies, and Tate and Violet attempt to rid the house of some of its ghosts once and for all.

CSI (10pm, CBS) - The CSIs investigate when Dr. Robbins' wife discovers a nude dead man in their master bedroom.

Moonshiners (10pm, Discovery) - Equipment failure and an intruder complicate a moonshining duo's operation, and footage demonstrating Popcorn Sutton's old-fashioned distillery methods.

The X-Factor (8pm, Fox) - The competition is down to the final five acts.

Harry's Law (9pm, NBC) - Harry, Oliver, and Cassie defend a mother accused of euthanizing her infant son who had an incurable debilitating disorder.

Becoming Santa (9pm, OWN) - An unjolly guy decides to recapture his lost Christmas spirit by becoming a Santa Claus. But before donning the red suit, writer-producer Jack Sanderson must go to Santa School.

Happy Endings (9:30pm, ABC) - A cash-strapped Max (Adam Pally, right) agrees to play Santa for Penny's charity function. Also, Jane realizes she accidentally gave her housekeeper the cash she'd put aside to pay for a Christmas vacation instead of the $200 Christmas tip that she intended. "The Middle" and "Modern Family" also have Christmas-themed episodes tonight.

American Horror Story (10pm, FX) - Violet learns about the rules of the house and Constance is questioned by police. We also learn how Larry got burned (it wasn't trying to save his family, says show creator Ryan Murphy).

CSI (10pm, CBS) - The CSIs work with the FBI to investigate the murder of a rancher who is also a ballistics expert.

Revenge (10pm, ABC) - Emily uncovers something Nolan has been hiding and uses it to take aim at Tyler. Also, Victoria reclaims some of her lost power, but her relationship with Conrad grows more sour.

Psych (10pm, USA) - I am excited to see any episode titled "The Tao of Gus." Tonight, Shawn and Gus hide a witness at a remote commune populated by eccentric intellectuals while they investigate a murder that the witness claims occurred in broad daylight.

Up All Night (8pm, NBC) - Reagan has trouble firing her under-performing assistant (Molly Shannon, left), causing Ava to question if Reagan's lost her edge. Also, Chris and Reagan search for a babysitter.

Modern Family (9pm, ABC) - The Pritchetts rally for a good cause after a neighbor's house burns down, but there is a downside to their good intentions when Jay hurts his back. Directed by Fred Savage.

Happy Endings (9:30pm, ABC) - Max's high school girlfriend moves back to town and has a profound effect on some of the gang. Meanwhile, Jane discovers Brad has a "work wife" and decides she's entitled to a "work husband."

American Horror Story (10pm, FX) - Moira persuades a perspective buyer to make an offer on the most haunted house in the history of the world, but Constance and Larry work to undermine her efforts. Meanwhile, Vivien and Luke (Morris Chestnut) grow closer. Security guard can't protect you from a ghost, Vivien!

The Devil You Know (10pm, Investigation Discovery) - Durham's Mike Peterson is the subject of tonight's episode, titled "Stairway to Hell." The half-hour program looks at the 2001 murder of Kathleen Peterson from the perspective of Kathleen's daughter Caitlin Atwater.

Revenge (10pm, ABC) - Lydia's memory issues could prove problematic for the Graysons, and a new arrival with a connection to Emily has dubious reasons for being in the Hamptons.

Psych (10pm, USA) - Shawn and Gus are admitted to a mental hospital to keep an eye on a billionaire who recently got off the hook for murder charges by pleading insanity.

The X-Factor (8pm, Fox) - The season premiere of Simon Cowell's new singing competition show, which is sure to give "American Idol" a run for its money. Tonight features auditions in LA, Chicago, Miami, Dallas, Seattle and Newark. Another episode airs tomorrow night at 8. If you're an "American Idol" fan, should you bother watching this one too? I say yes. More details here.

The Middle (8pm, ABC) - In the one-hour season premiere, the Hecks go on a camping trip, which sparks honeymoon memories for Frankie and Mike, whose honeymoon campout was spoiled by Mike's gloomy former classmate (Ray Romano).

Up All Night / Free Agents (8pm, NBC) - NBC's new comedies premiered last week but move into their regular time slots tonight.

Modern Family (9pm, ABC) - Another one-hour premiere, which begins with a Pritchett family vacation at a dude ranch in Jackson Hole, Wyoming. In the second half hour, Mitchell and Cameron plan to break the news of adopting another child, although this may not sit well with Lily. Brace yourself: the adorable Lily has been recast this season.

Harry's Law (9pm, NBC) - Season two gets a bit of a makeover. Brittany Snow and Aml Ameen are out, and Mark Valley ("Human Target," "Boston Legal") and Broadway actress Karen Olivo are in. Christopher McDonald (fast-talking Tommy Jefferson) is a regular. In tonight's season premiere, which beings a three episode arc, the show brings in guest actors Alfred Molina and Jean Smart.

Criminal Minds (9pm, CBS) - In the seventh season opener, the team's actions in the aftermath of the loss of Prentiss are questioned by a Senate committee, and a familiar person unexpectedly appears to rally them.

CSI (10pm, CBS) - Season 12 begins with the lab getting a new supervisor (Ted Danson, right), who helps the CSIs investigate multiple shootings and stabbings on a public tram. Danson may finally be what gets me to try to watch this show, which for some reason, I've never taken to.

Revenge (10pm, NBC) - The series premiere of a drama about a young woman (Emily VanCamp from "Brothers & Sisters) who returns to the Hamptons with a new identity to get revenge on people who destroyed her family years ago. My review. 

Law & Order: SVU (10pm, NBC) - SVU starts its 13th season without star Christopher Meloni, who opted not to return. In tonight's opener, an Atlanta detective (Kelli Giddish) joins the squad as Benson (Mariska Hargitay) tries to cope with the aftermath of a chaotic shooting in the precinct.

Not in Our Town: Light in the Darkness (10pm,  UNC-TV) - A documentary on the efforts of the Long Island town of Patchogue to address the underlying causes for a fatal 2008 hate crime attack on Ecuadorian immigrant Marcelo Lucero by a group of teens.

The big news: Ted Danson is heading to "CSI."

The big question: Is this something that could finally get me to try to watch at least one full episode of "CSI?"

Danson is best known for his comic portayal of Sam Malone on the long-running NBC sitcom "Cheers," and then spent six years heading the CBS sitcom "Becker." But Danson can definitely do drama, as fans of "Damages" can attest (Danson was nominated for an Emmy for playing the rotten CEO, Arthur Furbisher). Danson also currently stars on the HBO series "Bored to Death," and he's absolutely hilarious there, and makes occasional appearances on Larry David's "Curb Your Enthusiasm."