Tonight, we get answers to two of the most hotly debated questions in primetime television.

First, just what will they find at the bottom of that hatch when “Lost” (8 p.m., ABC) returns for season two? A retrospective clip show (7 p.m.) precedes the season opener to refresh fans’ memories and inform newcomers.

Second, over on NBC, we get to see just what kind of “The Apprentice” (7 p.m., NBC) host Martha Stewart can become. In tonight’s opener, the 16 contestants break into two teams to try to concoct a children’s book that will please the domestic diva. Will viewers flock to see Stewart in primetime? Can she concoct a signature sendoff to rival Trump’s “You’re fired!”?

Tonight’s other highlights

¢ Only six remain on “So You Think You Can Dance” (7 p.m., Fox).

¢ A sick character kidnaps a team member on “CSI” (8 p.m., CBS), postponed from an earlier date.

¢ A young gun inspires a tired idealist on the pilot episode of “Just Legal” (8 p.m., WB).

¢ “American Masters” (8 p.m., PBS) profiles Lucille Ball.

¢ A kidnapping may require a big compromise on “Law & Order” (9 p.m., NBC).

¢ “Science of the Bible” (9 p.m., National Geographic) ponders just how Jesus might have traveled around Galilee and just how many people could have heard him deliver the Sermon on the Mount.

Series notes

Brian’s breakthrough on “Still Standing” (7 p.m., CBS) … Tyra Banks is host to “America’s Next Top Model” (7 p.m., UPN) … Nathan needs more than money on “One Tree Hill” (7 p.m., WB) … Greg takes it a little too easy on “Yes, Dear” (7:30 p.m., CBS) … A new client on “Head Cases” (8 p.m., Fox).

Late night

George Clooney and Steve Martin appear on “Late Show with David Letterman” (10:35 p.m., CBS) … Jay Leno is host to Chris Rock, Sandra Oh and Trisha Yearwood on “The Tonight Show” (10:35 p.m., NBC) … Johnny Knoxville, Chi McBride and Backstreet Boys appear on “Jimmy Kimmel Live” (11:05 p.m., ABC).

Ice T and Steve Winwood chat on “Late Night with Conan O’Brien” (11:35 p.m., NBC) … Craig Ferguson is host to Nick Cannon and Lawrence Turman on “The Late, Late Show” (11:37 p.m., CBS).