'The Big Bang Theory': Raj (Kunal Nayyar, left) surprisingly gets relationship advice from Sheldon (Jim Parsons). (SONJA FLEMMING/CBS)

One terrible, horrible, no good, very bad day for Penny has her reevaluating all her choices — which includes her relationship with Leonard — on “The Big Bang Theory” (CBS at 8 p.m.).

The 12 remaining chefs on “Hell’s Kitchen” (Fox at 8) compete in a lightning round that has them cooking an entree from surprise ingredients in just 30 minutes.

Musician John Legend, tennis star Andy Roddick, actor Donald Faison and models Chrissy Teigen and Brooklyn Decker compete on “Hollywood Game Night” (NBC at 8).

The American Comedy Awards (NBC at 9) honors the highest achievements in film and television. This year, the Johnny Carson Award for Comedic Excellence will be presented to Bill Cosby.

One contestant is booted off “American Idol” (Fox at 9), narrowing the group to three vocalists.

FINALE WATCH: The revamped “Two and a Half Men” (CBS at 9) will wrap up its 11th season with Alan facing the consequences of revealing his true identity to Larry.

With Cristina (Sandra Oh) on her way out of the hospital on “Grey’s Anatomy” (ABC at 9), it looks as though Amelia, Derek’s little sister, could be taking her place, but it all depends on her feelings about Seattle.

canceled Christopher Meloni vehicle “Surviving Jack” (Fox at 9:30) closes its one and only season with the children, Joanne and Jack at odds.

RETURNING SHOW: The all-too-real “Maron” (IFC at 10) returns for Season 2 with Marc becoming his own worst enemy after flubbing an appearance on “Talking Dead.”

Holmes and Watson come in contact with MI6 after a seemingly routine murder investigation shows its political and international implications on “Elementary” (CBS at 10).

RETURNING SHOW: “Comedy Bang! Bang!” (IFC at 10:30) is back for Season 3, and it has Patton Oswalt and host Scott Aukerman competing for the same acting role.

Actors Michael Fassbender and Zoe Saldana stop by “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35).

Actors James Franco and Idina Menzel come to the “Late Show With David Letterman” (CBS at 11:35), with a performance by the Broadway cast of “If/Then.”

The Los Angeles Lakers’s Kobe Bryant and actress Lake Bell are on “Jimmy Kimmel Live” (ABC at 11:35), with music from Pharrell Williams.

Rachel Lubitz