Elementary 10 p.m., Channel 4

This is a relatively painless hour. And it’s easier to watch knowing that the showrunner, Rob Doherty, has made a public promise that Sherlock (Jonny Lee Miller) and Watson (Lucy Liu, above with Miller) will never, I repeat, never be romantically involved. It’s not nearly the show that PBS’s “Sherlock” is, but it’s a pleasant enough New York procedural, especially if you can block out Arthur Conan Doyle. Tonight, the pair try to find a missing child.

The Daily Show With Jon Stewart 11 p.m., Comedy Central

A post-post-pre-debate President Obama visits the Daily Show. This makes his sixth appearance, his second while in office.

Vampire Diaries 8 p.m., Channel 56

Dear Diary, I need a new bed.

Beauty and the Beast 9 p.m., Channel 56

Minus the beast.

The League 10:30 p.m., FX

One Chalupa, coming right up.