"Nature"
7 p.m. to 10 p.m., PBS (New)
Go inside the mysterious and suprisingly human-like world of whales and dolphins. For example: it is believed that dolphins have names. Discuss ...
"American Idol"
7 p.m. to 9 p.m., Fox (New)
The singers get one last chance to impress the judges. After the crazy Hollywood round, we're putting money on at least one of them fainting.
"Arizona Republican Presidential Debate"
7 p.m. to 9 p.m., CNN (live)
The GOP final four, Ron Paul, Rick Santorum, Newt Gingrich and Mitt Romney, square off in Arizona.
"Strangers on a Train"
7 p.m. to 9 p.m., TCM (1951)
Boost your film cred by watching this Hitchcock masterpiece about a man duped into a murder pack with a demented playboy.
"Survivor: One World"
7 p.m., CBS (New)
Now that the tribes have had a chance to size each other up, it's time for the dysfunction to begin.
"The Middle"
7 p.m., ABC (New)
After a sit-down meeting with the kids, Frankie and Mike take a break from their constant parenting responsibilities.
"Criminal Minds"
8 p.m., CBS (New)
A series of home invasions appear to be gang-related but the investigation reveals that the crimes are much more sinister.
"Modern Family"
8 p.m., ABC (New)
Secrets are spilling everywhere when Gloria learns a long-held secret of Claire's and Phil makes an uncomfortable discovery about one of his daughters.
"Happy Endings"
8:30 p.m., ABC (New)
The group of friends can set their calendars by the "spring smackdown" between Jane and Brad.
"CSI: Crime Scene Investigation"
9 p.m., CBS (New)
The team investigates when a house is stolen — yes, stolen — from its foundation.
— Laura King
Contact the writer:
444-1345; laura.king-homan@owh.com
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