Thursday’s TV highlights

SERIES

So You Think You Can Dance: Judges Nigel Lythgoe, Mary Murphy and a variety of guest judges helped narrow the field to the final four dancers, and in tonight’s season finale, the best of the best will be named (8 p.m. Fox).

Expedition Impossible: The six remaining teams tackle Morocco’s Lake Bin el Ouidane in this new episode (9 p.m. ABC).

Rookie Blue: Division 15 is put under a quarantine after a seemingly drunken suspect brought in by Gail and Traci (Charlotte Sullivan, Enuka Okuma) collapses from a mysterious illness in this new episode (10 p.m. ABC).

Extreme Chef: The three chefs must create and cater a wedding dinner and have to get all their food from the 99-cent store in this new episode (10 p.m. Food).

Russian Dolls: This new series takes a candid look inside a Brooklyn, N.Y., neighborhood that’s home to a multigenerational community of Russian Americans (10:32 p.m. Lifetime).

SPECIALS

America’s Election HQ: Members of the current crop of Republican presidential candidates debate the major issues of the day. Expected to participate are: Rep. Michele Bachmann (Minn.); Herman Cain; former House Speaker Newt Gingrich (Ga.); former Gov. Jon Huntsman (Utah); Rep. Ron Paul (Texas); former Gov. Tim Pawlenty (Minn.); former Gov. Mitt Romney (Mass.); former Sen. Rick Santorum (Pa.) (6 and 9 p.m. Fox News Channel).

Make Me Superhuman: Can a person don a mechanical suit and then leap a tall fence, toss a car off a cliff or carry hundreds of pounds for miles? (6 p.m. National Geographic).

SPORTS

Tennis: U.S. Open Series: Rogers Cup (9 a.m. ESPN2).

Baseball: Regional coverage (9 a.m. and 5 p.m. MLB); the Angels visit the New York Yankees (10 a.m. FSN).

Little League baseball: World Series Midwest Regional semifinals (11 a.m. ESPN; 3 p.m. ESPN2); Northwest Regional semifinals (1 p.m.; 7 p.m. ESPN2); Southwest Regional Final (5 p.m. ESPN2).