Prep football (6:30 p.m., Ch. 14): Bountiful at Mountain Crest
Presidential debate (7 p.m., Channels 2, 4, 5, 7 and 13, BBC America, CNN, C-SPAN, FNC and MSNBC): At press time, Sen. John McCain and Sen. Barack Obama's debate was up in the air. If it doesn't happen, networks will be scrambling.
Are You Smarter than a 5th Grader? (8:30 p.m., Ch. 13): Jeff Foxworthy hosts.
The Mentalist (9 p.m., Ch. 2): If you missed the premiere on Tuesday, CBS repeats it tonight.
20/20 (9 p.m., Ch. 4): Sen. Barack Obama and Sen. John McCain, their families and close friends are interviewed.
Suite Life on Deck (9 p.m., Disney): The Suite Life of Zack & Cody morphs into a (sort of) new show. The boys are now on board a cruise ship that's also a school.