LOOK WHO'S TALKING AMONG THEIR SELVES

Cheech Marin all but steals From Dusk Till Dawn by popping up as a customs inspector, a strip-joint barker, and an underworld honcho. Yet that hat trick pales next to the extra duty in store for these marquee names:

Eddie Murphy He may be a megastar again after people see June's bravura remake of The Nutty Professor, in which Murphy tackles seven roles.

Michael Keaton The actor meets himself coming and going in July's cloning comedy Multiplicity.

Jack Nicholson Keaton's Bat-nemesis has two roles in Tim Burton's sci-fi sortie Mars Attacks!

John Travolta Roman Polanski will direct Travolta and Travolta in The Double, based on Dostoyevsky's novella.

Why the multi-flurry? ''Playing against yourself is such a challenge that getting actors interested is never a problem,'' says Double producer Todd Black. Among those who flirted with Black's project but passed: Jack Nicholson. Presumably, he didn't want to repeat himself.

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