TV tonight: Debate, 'HIMYM,' 'Crash Course'

• CBS' Bob Schieffer hosts final presidential debate
• Non-debate options: '90210,' 'Gossip Girl,' 'Mother'
• 'Top Gear' host Hammond takes 'Crash Course' in Hollywood stunts

How I Met Your Mother
CBS, 8 ET/PT

Thanks to the presidential debate on one side and a baseball pre-emption on the other, it's a terrible night for broadcast scripted programming. Your only choices are CW's two teen soaps, 90210 (8 ET/PT) and Gossip Girl (9 ET/PT) —which, for most adults, don't count as a choice at all — or two sitcom repeats on CBS. To make matters worse, the Mother repeat isn't even from this season; it's the Valentine's-themed episode from last year. In this corner, however, an old Mother still beats new editions of Dancing With the Stars and The Voice. Just make sure you change the channel when Partners (8:30 ET/PT) pops up with an episode about a sexual drought that is silly and dreary even by this struggling young show's current standards.

Presidential Debate
9 ET/6 PT

CBS's Bob Schieffer moderates the third and final presidential debate, which is scheduled to focus on foreign policy. You'll find it on ABC, CBS, NBC and PBS, along with all the expected cable outlets.

Crash Course
BBC America, 10 ET/PT

In an evening over-saturated with reality programming, the second season return of this stranger-in-a-strange-land comic documentary is at least a better choice than most. Once again, British Top Gear host Richard Hammond wanders America, lighting for five days in one place to learn some peculiarly American job — from serving as a bike messenger in San Francisco to, tonight, working as a Hollywood stuntman.