Today on TV

Wipeout (7 p.m., Ch. 4): Another new episode of this weird, goofy game show.

So You Think You Can Dance (7 p.m., Ch. 13): It's the Las Vegas callbacks.

Soccer (8 p.m., ESPN): In a World Cup qualifier, the United States travels to Costa Rica.

The Unusuals (9:01 p.m., Ch. 4): Alvarez is in charge while Sgt. Brown is away.

Law & Order (9 p.m., Ch. 5): In the 19th-season finale, a charity fundraiser is murdered. NBC has renewed this show for a 20th season, which means it will tie "Gunsmoke" as the longest-running series in prime-time-TV history. Sort of. Assuming there are 22 episodes in Season 20, that will bring "Law & Order" to a total of 455 episodes. Over the course of its 20-year run (1955-75), "Gunsmoke" produced 635 episodes. Oh, and there were five "Gunsmoke" TV movies between 1987-94.

Mythbusters (10 p.m., Discovery): Is it possible to cling to the roof of a speeding car? (Don't try this at home!)