TONIGHT'S MUST-SEE

"Head Cases" debut, 8 p.m., Fox. Jason Payne and Russell Shultz are both lawyers who had mental breakdowns. Now they have to work together. Payne (Chris O'Donnell) is handsome, fashionable and — until his wife gave up on him — was rich. Shultz (Adam Goldberg) is scraggly and uncensored, but provides the passion and eccentricity Payne needs. The result seems contrived, yet it does keep us entertained. We like Shultz instantly and even the button-down Payne has his moments.

"American Masters: Ernest Hemingway: Rivers to the Sea," 9 p.m., PBS. Ernest Hemingway has an image as a blue-collar brawler, a rugged action figure. He was much more. He had, his first wife said, "so many sides to him you could hardly make a sketch of him in a geometry book." This first-rate documentary captures that and is decorated with the gorgeous landscapes he loved.

OF NOTE

"The Terminator" (1984), 6 p.m., Spike TV. A young woman (Linda Hamilton) is bewildered when she's chased by an android from the future (Arnold Schwarzenegger). This beautifully crafted film showed the immense talent director-writer James Cameron would later prove with "Titanic." It did not show what was ahead for Schwarzenegger.

"So You Think You Can Dance," 7 p.m., Fox. It's down to eight dancers.

"TV Land Confidential: Network Notes," 7 and 10 p.m., TV Land. In the early days, this documentary says, network censors were forever getting compromises. Fonzie could only wear his black leather jacket, for instance, if he was near his motorcycle. It was a strange time, and this special is highlighted by a slick assortment of clips and documents.

"American Experience: Fatal Flood," 8 p.m., PBS. This documentary looks at the 1927 Mississippi River flood, which rampaged all the way from Illinois to New Orleans.

"Lost," 8 p.m., ABC. A rerun of last season's finale. The castaways have pinned their hopes on a raft, but things go wrong.

"Made in the USA" debut, 10 p.m., USA Network. In this reality series, the judges start with 50 teams (duos, mostly) with clever ideas for new products, then whittle them down to six. The winner will get to pitch the product for a year on the Home Shopping Network.