Greatest American Dog (7 p.m., Ch. 2): The show moves to Wednesdays (from Thursdays); a fourth team is eliminated.

The Baby Borrowers (8 p.m., Ch. 5): In the finale, the teens care for senior citizens who can't care for themselves.

Nova scienceNOW (8 p.m., Ch. 7): A NASA mission to Mars; a look inside fossilized mammoth tusks.

So You Think You Can Dance (8 p.m., Ch. 13): The remaining six contestants — including Utahn Chelsie Hightower — perform. Two will be eliminated on Thursday.