SPOTLIGHT

'30 Rock'

7 p.m. on NBC

In an hour episode, Liz and Criss (Tina Fey and James Marsden) need to buy a dining room table before they can celebrate Valentine's Day, and Mary Steenburgen guests as Jack's mother-in-law.

 

NEW TONIGHT

'American Idol'

7 p.m. on Fox

Tensions are high, we're told, as the Hollywood Round continues.

 

'The Big Bang Theory'

7 p.m. on CBS

I would tell you what this episode is about, but all I know is the title: "The Vacation Solution."

 

'Grey's Anatomy'

8 p.m. on ABC

On Valentine's Day, Mark and Lexie baby sit.

 

'Person of Interest'

8 p.m. on CBS

Astro (anybody remember him from "The X Factor"?) makes his acting debut as a teen whose brother was murdered.

 

'The Office'

8 p.m. on NBC

Dwight (Rainn Wilson) is assigned to a secret project that takes him to Florida, while Pam (Jenna Fischer) returns from maternity leave.

 

'The Mentalist'

9 p.m. on CBS

Patrick tries to prove the innocence of a woman on trial for murder.

 

'The Vampire Diaries'

9 p.m. on the CW

Damon and Stefan tag along with Elena (Nina Dobrev) is invited to a formal ball at Klaus' newly renovated mansion.