Actors Who've Costarred With...Themselves

Just the phrase ''identical-twin gynecologists'' is kind of chilling. Then add ''a psychological horror movie by David Cronenberg.'' Obviously this is a job for Jeremy Irons, master of the highbrow kinky. Irons maintains cool control of the brothers' two different patterns of disintegration while wielding frightfest gynecological tools to create the most ­disturbing twins you'll ever see. A

Murphy plays both humongously fat professor Sherman Klump and the prof's trim-tiger alter ego, Buddy Love, at full throttle (as Jerry Lewis did before him). Yet with so much manic Murphy energy to go around, dual roles are, in the end, not enough. So how about Murphy times seven? The star also plays almost the entire Klump family, all farting around the dinner table. B+

One meeellion dollars? More like worldwide box office revenue of $675 million. Myers always appears to be channeling multiple personalities at once — a little of him goes a long way. Who better to play James Bond-ilicious superspy Austin Powers and his nemesis, Dr. Evil, for maximum parody power? B+

It's almost heartbreaking now to watch Lohan, then so brimming with as-yet-unbruised talent and fresh-faced sweetness, in her movie debut. The 11-year-old star-in-the-making takes a twosome role created 37 years earlier by beloved Hayley Mills and effortlessly makes it her own. A-

Cage is devilishly subtle in a fat suit as competitive brothers — the only way to carry off Charlie Kaufman's quadruply ­ingenious story structure replicating the kind of crazy personality splits symptomatic of writers in general and successful Hollywood screenwriters in particular. A

The devil was Saddam Hussein's sadistic, psychopathic playboy son Uday; his unlucky body ­double was purportedly Latif Yahia, an Iraqi soldier forced into service. The truth of this ''true story'' is questionable, but the movie is riveting, all because of Cooper's bravura double work as a decent man forced to imitate the actions of a dangerous madman. A

One twin is an Ivy League philosophy professor, the other grows pot back home in Oklahoma in this eccentric little gem. And Norton, an actor who thrives on total-immersion character transformation, has a ball — times two. A

Davis plays a woman who murders her twin sister and assumes her identity (and that's just for starters) in this high-camp thriller. The feverishly nutty story has nothing to do with Dead Ringers — and everything to do with Davis playing to her What Ever Happened To Baby Jane? constituency, with Bette Davis Eyes. C+

As befits this cool, broody sci-fi story set on the dark side of the moon, Sam Rockwell plays a corporate astronaut and also, well, something much cooler, broodier, and more sci-fi-centric than a simple twin. A-

DiCaprio's instinct to do something different after Titanic was sound, but this tortured historical drama, with Leo as France's 17th-century king Louis XIV and his (iron-masked) twin brother, Philippe, doesn't do the star any favors. Twice. C