Who Wants to Be a Millionaire (8 p.m., ABC) continues its latest celebrity edition featuring pop, country and R&B singers. On a rerun of The Simpsons (8 p.m., Fox), Sideshow Bob hypnotizes Bart into killing Krusty. The new reality series Murder in Small Town X (8:30 p.m., Fox) begins with a 90-minute episode. Ten contestants are brought to a small town to try to figure out a murder mystery; the "murder" is staged and the "townspeople" are actors. It's sort of a cross between a game of Clue and dinner theater. Steve Martin and two former "Late Show With David Letterman" producers are the execs behind The Downer Channel (8:30 p.m., NBC), a new sketch comedy show starring Wanda Sykes, Mary Lynn Rajskub, Lance Krall and Jeff Davis.

Specials

The new TV movie Trapped (9 p.m., USA) stars Parker Stevenson as a Vegas hotelier trapped inside his burning resort with his daughter and other guests. Yeah, we saw "The Towering Inferno," too.

Sports

Baseball:
Reds at Braves (7:30 p.m., TBS)

Talk

Rosie O'Donnell (syndicated) Rod Stewart, Chris Kattan (rerun)
David Letterman (CBS) Tom Selleck, David Rakoff
Jay Leno (NBC) Michael Clarke Duncan, Mary Chapin Carpenter
Politically Incorrect (ABC) Jimmie Walker, Ali Landry
Conan O'Brien (NBC) Joe Strummer
Craig Kilborn (CBS) Illeana Douglas, Cake

All times Eastern unless noted.