Sometimes when a film has little or nothing else to recommend it, the movie in question has to rely on star power. Case in point: The extremely derivative and predictable comedy "Six Days, Seven Nights."

Though it sounds like a bad combination, the unlikely pairing of Harrison Ford and Anne Heche as the-couple-destined-to-be-together nearly saves the movie. However, though they are appealing together, the two are no modern-day (Spencer) Tracy and (Katherine) Hepburn, which is what producer/

director Ivan Reitman ("Fathers Day") was obviously hoping for.As for the film itself, Reitman is lucky to have gotten Ford and Heche to be in it, or things would have been much worse. This romantic comedy/adventure is so slight and so lackluster that it comes off as a ripoff of "Romancing the Stone," with bits of TV's "Gilligan's Island" thrown in for good measure.

Heche stars as Robin Monroe, a workaholic assistant magazine editor on a romantic island trip with her fiance, Frank Martin (David Schwimmer, of TV's "Friends"). Once there, Robin accepts Frank's marriage proposal, but she also quickly heads back to Tahiti on a work trip with salty pilot Quinn Harris (Ford).

As fate would have it, bad weather forces Quinn's plane to crash on a deserted island, which also destroyes the radio and emergency beacon.

Suddenly faced with dim prospects for rescue and forced to rely on each other for survival (especially when they run into modern-day pirates), Quinn and Robin bicker at first but soon discover a mutual attraction.

Meanwhile, Frank, who believes that Robin has perished, finds comfort in the arms of Quinn's comely friend, Angelica (Jacqueline Obradors).

What happens next won't surprise anyone, nor will it enthrall many audiences. And this sad situation isn't helped by Reitman's uninspired direction or screenwriter Michael Browning's lame one-liners.

That leaves it up to the cast to try to salvage the picture.

And though both Ford and Heche really try to do something with the thin material, Schwimmer's just doing his "Friends" sensitive-guy routine for the umpteenth time. As for Obradors, her obnoxious one-note performance consists of giggling and jiggling.

"Six Days, Seven Nights" is rated PG-13 for profanity, violent gunplay and fistfights, vulgar gags and double-entendres, partial female nudity (some particularly skimpy outfits worn by Heche and Obradors) and brief gore.