TONIGHT'S MIGHT-SEE

"Click & Clack's As the Wrench Turns," PBS. 8 p.m. It's been a while since we've had a cartoon based on a radio show with two car mechanics. Tom and Ray Magliozzi provide the voices of their alter-egos, Click and Clack Tappet. On radio, they answer car questions. This debut episode gives them a much bigger story. They are awful at fundraising. They raise zero (or less) and the station is in jeopardy. Their solution is to run for office and pocket the campaign contributions. There's a mild amount of fun here, plus light satirical slaps.

OF NOTE

"Knocked Up" (2007), 5 p.m., HBO. A diligent woman (Katherine Heigl) accidentally gets pregnant via a directionless guy (Seth Rogan); opposite forces try to blend. Judd Apatow has written and directed a likable film, sparked by Heigl's warmly funny character.

"Martin Lawrence Presents 1st Amendment Stand-up," 7 p.m., Starz. Over the next 10 weeks, this series — produced by Martin Lawrence and hosted by Doug Williams — will include 35 standup comics.

"So You Think You Can Dance," 7 p.m., Fox. We're down to a dozen dancers now.

"Criminal Minds," 8 p.m., CBS. As the second half of a two-parter begins, Reid has been kidnapped, bound and drugged. Now his colleagues try to rescue him.

"Nova ScienceNow," 9 p.m., PBS. Fans of ABC's "Hopkins" series already know Dr. Alfredo Quinones-Hinojosa; this hour includes a portrait. Once an illegal-immigrant farm hand, he's now a Johns Hopkins University leader in brain surgery and brain-cancer research.

"CSI:NY," 9 p.m., CBS. Mac and Stella investigate robberies of rich people in Manhattan. There may be a connection between this and a hot car, rigged up with devices that James Bond would love.