Pretty Little Liars (8pm, ABC Family) - Aria, Emily and Spencer think Mona has regressed to her old bad behavior, but they have no proof, and Hanna has doubts about their claim.
Pioneers of Television (8pm, UNC-TV) - The Season 3 premiere spotlights female comedians, including stand-ups Phyllis Diller and Joan Rivers, and sitcom stars like Lucille Ball, Marla Gibbs, Mary Tyler Moore and Betty White. Also, Carol Burnett shares stories about her variety show, and there is commentary from Margaret Cho and Tina Fey.
Ben and Kate (8:30pm, Fox) - Tommy introduces his new girlfriend to the gang, and Kate tries to get to know her better. Meanwhile, Ben works on his Rail Mail business plan.
Go On (9pm, NBC) - Ryan decides to go on his first date, but snowboarder Shaun White (playing himself) ends up being his romantic rival.
Real Husbands of Hollywood (10pm, BET) - The lives of a group of Hollywood husbands are tracked in this semi-scripted reality show spoof starring Kevin Hart, JB Smoove, Robin Thicke and others. In tonight's premiere, Kevin kicks a fellow hubby out of a weekly poker game. Adrienne reviews.
Parenthood (10pm, NBC) - Victor's adoption deadline nears, prompting Julia and Joel to reconsider their family's future. Also, Mark tells Sarah and Hank that he intends to win Sarah back.
Justified (10pm, FX) - Raylan tangles with members of a dangerous family, and Boyd targets an unusual preacher.
Frontline: Inside Obama's Presidency (10pm, UNC-TV) - An examination of President Barack Obama's first term, including his battles with Republicans over health care reform and the economy, and his expansion of the targeted killings of enemies.
Second Generation Wayans (10:30pm, BET) - Nephews of the comedic Wayans brothers seek their own success in Hollywood in this new comedy series starring Damien Dante Wayans and Craig Wayans.
Ben and Kate (8:30pm, Fox) - Kate and Will go on a camping trip together, but their romantic getaway is interrupted by some unwelcome guests.
Rizzoli & Isles (9pm, TNT) - Jane and the team snoop when a man dies from poisoning at a cafe in a case that brings Stanley's true feelings to the fore. Later, Tommy and Lydia clash over custody of their baby. Tonight's episode is the first in a five-episode run that will close out Season 3.
victim, a Marine captain suffering from PTSD, maybe the key to finding the killer.
Ellen DeGeneres: The Mark Twain Prize (8pm, UNC-TV) - Ellen DeGeneres is honored with the 15th Mark Twain Prize for American Humor. Among those paying tribute, Kristin Chenoweth, Steve Harvey, Sean Hayes, Jimmy Kimmel and Lily Tomlin.
Dr. Horrible's Sing-Along Blog (9pm, CW) - The popular web series starring Neil Patrick Harris (right) and Nate Fillion comes to regular TV tonight. In the inspired Josh Whedon musical, an aspiring super villain (Harris) tries to gain acceptance into the Evil League of Evil to impress a pretty girl at a laundromat. Unfortunately, his superhero arch nemesis, Captain Hammer (Fillion), keeps thwarting his attempts. If you've never seen it, do yourself a favor and check it out.
Raising Hope (8pm, Fox) - In the Season 2 premiere, the Chances meet Sabrina's mother (Melanie Griffith, left) at a funeral for her grandmother. The grandmother's videotaped will has a big impact on Jimmy and Sabrina's relationship.
New Girl (8pm, Fox) - In the Season 2 opener, Jess is laid off from her teaching job and volunteers to be a shot girl at Schmidt's "rebranding" party. Parker Posey guest stars as a jaded cocktail waitress. In a second episode airing at 9, Jess pretends she's someone else when a handsome stranger (the amazing David Walton, right) mistakes her for his blind date.