Zero Hour 8 p.m., Channel 5

Dr. Green lives! OK, not Dr. Green, but Anthony Edwards does return to TV in this elaborately plotted, “Da Vinci Code”-esque new series. Edwards told reporters at the recent Television Critics Association press tour that he hadn’t expected to return to TV after “ER,” but he couldn’t deny this script. “I read it, and I could not put it down. And I just said, ‘If these guys are crazy enough to tell this story, I want to do it with them.’ ” Creator Paul Scheuring also promised he knows where the show is going, unlike other creators of serialized shows he’s met over the years. “Before I even put pen to paper in any kind of sense in this, I’m like, ‘What’s the coolest MacGuffin you can come up with? What are the last frames of this series?’ ” Remember he said that. (See review, Page 6.) Pictured (from left): Addison Timlin, Scott Michael Foster, and Edwards.

American Idol 8 p.m., Channel 25

Mariah Carey, Keith Urban, and Nicki Minaj (above, from left) are settling in as judges but the live shows will be the real test. Hollywood rounds come to a close and the top 40 contestants are revealed.

The Big Bang Theory 8 p.m., Channel 4

Count on “BBT” for a good V-Day episode title: “The Tangible Affection Proof”

Community 8 p.m., Channel 7

Halloween on Valentine’s Day. (Or: what happens when you push back the premiere.)

Glee 9 p.m., Channel 25

Emma and Will tie the knot.