TONIGHT'S MUST-SEE

"House," 8 p.m., Fox. Mira Sorvino made a guest appearance in this strong hour, which made its debut after the Super Bowl. She plays a doctor in Antarctica, stricken with a mysterious ailment. (OK, all "House" ailments are mysterious.) Dr. House must come up with a long-distance diagnosis.

"Eureka" season-opener, 9 p.m., Sci Fi. To test anti-aircraft guns, the company has space drones. The drones always lose, sort of like the opponent in Harlem Globetrotter games. Then one wins — and terrorizes the town. The sheriff must figure out what went wrong. "Eureka" episodes vary from loose and whimsical to dead-serious. Last season's strong finale (rerunning at 8 p.m.) was serious; so, mostly, is this a fairly good hour.

OF NOTE

"Ocean of Fear" (5 p.m.), "Dirty Jobs" (6) and "How Not to Become Shark Bait" (7), Discovery Channel. "Shark Week" continues, includes a new "Dirty Jobs" that views Greenland sharks.

"Nova," 8 p.m., PBS. The "Car Talk" guys are emerging as summer stars on PBS. Tonight, "Nova" reruns their amiable look at new auto ideas. Their offbeat cartoon is at 8 p.m. on Wednesdays.

"America's Got Talent," 8 p.m., NBC. Tonight's hour views people who originally auditioned on MySpace. Yes, "Talent" is taking its time; it will return after the Olympics, continuing into October.

"Wide Angle: Lord's Children," 9 p.m., PBS. Until recently, this film says, children as young as 5 have been kidnapped by a rebel army in Uganda. As many as 30,000 became soldiers or sex slaves. This film introduces three who escaped and are in rehab.

"Without a Trace," 9 p.m., CBS. Life is dangerous on the outside, too. An ex-con vanishes after a prison visit.