"Nip/Tuck" could well be TV's most outrageous drama series and, not infrequently, one of TV's smartest. A show about two leading South Beach plastic surgeons, it starts at the surface and then penetrates as surely (and, at times, as cringe-inducingly) as the scalpels of Drs. Sean McNamara and Christian Troy in the midst of a tummy-tuck.

Returning for its fourth season, "Nip/Tuck" is ready for more perfect bodies and far-from-perfect behavior in the shared world of Christian and Sean (played by series stars Julian McMahon and Dylan Walsh).

Meanwhile, Christian, the narcissistic womanizer, goes to a shrink (guest star Brooke Shields) to iron out his intimacy issues, and leaves racked by self-doubt. Since the person he feels closest to is Sean, his medical partner and best friend, could he possibly be gay?

Guest star Kathleen Turner plays a phone-sex operator who wants a surgical "voice lift," and Larry Hagman appears as a macho business mogul who wants a surgical upgrade of his, um, masculine accessories.

"Whatchu talkin' 'bout?" That laugh-line became a lifelong noose for Gary Coleman as a childhood sensation on NBC's popular sitcom "Diff'rent Strokes." His was a showbiz career that strangled him, then discarded him, before he was out of his teens. A TV film, "Behind the Camera: The Unauthorized Story of 'Diff'rent Strokes"' revisits the comedy hit and the personal tragedies it spawned, which, of course, weren't limited to Coleman's. A better-than-average chronicle of Hollywood's pitfalls, the film not only takes viewers behind the scenes, but also follows the lives of Coleman and his co-stars Todd Bridges and Dana Plato in the years after the series went off the air and their personal lives spiraled downward. Coleman and Bridges participated in the project and appear on-camera for interviews woven through the drama. Bobb'e J. Thompson stars as the young Gary Coleman. It airs 8 p.m. Monday on NBC.

Lots of people remember their first day of school. But too many children will never have one. More than 100 million school-age children worldwide won't be in a classroom this year, and one in four kids in the developing world will drop out before completing even four years. "Back to School," the second installment in a 12-year documentary project that began in 2003, revisits seven children in seven countries who are striving to beat the odds against getting an education. The 90-minute film is a special installment of PBS' "Wide Angle," a series that explores forces shaping the world today with a special focus on underreported stories from around the globe. "Wide Angle" will periodically check in on the students, now in third grade, through 2015. Meet them on this edition of "Wide Angle," airing 9 p.m. Tuesday (check local listings).

The concept of the luxury high-rise apartment wasn't born in a modern metropolis, but instead in the minds of Roman architects more than 2,000 years ago. Long before the United States and the Soviet Union were locked in an arms race, the ancient Greeks were developing weapons of mass destruction to overcome their enemies' growing defenses. From sports arenas to medicine and mining, the ancient roots of modern technology are tracked down in "Where Did It Come From?" This new series, with host Michael Guillen, premieres 8 p.m. Thursday on the History Channel.

It's Los Angeles' most famous cold case, a murder so beguiling it has spawned a cult following, best-selling books and, later this month, the Brian De Palma film "The Black Dahlia." In 1947, the body of a young actress wannabe named Elizabeth Short was found in a vacant L.A. lot undressed, bisected at the waist and mutilated. In this edition of "Cold Case Files," host Bill Kurtis revisits the murder investigation. He begins with a look at a book on the probe by former L.A. detective Steve Hodel, who concludes that his own father, physician George Hodel, is the man who committed the grisly crime. But the Los Angeles Police Department has its own ideas about the case and lets Kurtis get a look inside the official case file. Can the case ever be solved? Examine the clues on A&E's "Cold Case Files" at 9 p.m. Saturday.

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