A classic case of a movie idea being better than the movie itself, The One was one of several Jet Li vehicles to bring his impressive Wu Shu skills to a western audience in the most inplausible way possible. I'm convinced that it's a rite-of-passage for any martial artist action star to be in a movie where they have to fight someone who looks just like them. Whether it turns out to be a clone (Arnie in 6th Day), their identical twin brother (Jackie Chan in Twin Dragons, Van Damme in Double Impact), themselves from a different time period (Van Damme again in Timecop) or - in this case - an alternate dimension version of themself, it gets to the point where one tends to roll their eyes at any new attempt Hollywood makes to say "the only guy left for _______ to beat... is himself!"
The One's premise actually has promise though, if you excuse the alliteration. Basically, there are various alternate universes that make up "the multiverse", each with the same people living completely different lives in a completely different version of Earth. There's one dimension in particular that has managed to advance so much technologically that they have learned about the existence of this multiverse, and have taken it upon themselves to police it. Probably because the only people likely to take advantage of the multiverse criminally would be those from the same dimension, since they're the only ones who both know about it and can travel through it. These dimension-travelling agents who work for the multiverse police force have various gadgets at their disposal allowing them to move between the dimensions and track down elements that don't belong there.
In the movie, one of the many characters Jet Li plays is one of these dimension-travellers who has discovered a way to become Godlike by eliminating all his likenesses across the dimensions. Apparently, each time someone dies, their life essence spreads to the other surviving likenesses across the dimensions, making them marginally more powerful. After killing so many of his likenesses Yu Law (Jet Li's character) has become incredibly potent, boasting superhuman speed and strength. And with these skills he continues his massacre of likenesses practically unchallenged to achieve his goal of becoming The One. The only one strong enough to stop him is his only remaining likeness, also played by Jet Li, who is just as strong and fast as he is. I also need to stop saying "likenesses". Right now.
So we have this intriguing mix of Timecop and Highlander, as powerful entities become more powerful as they narrow themselves down to a single omnipotent being. Of course, it has its gaping holes in logic (such as what happens when all but one version of that person dies of old age? Providing the last few versions don't all die at the same time), but it's still an enthralling concept. Even ignoring the whole "becoming the One thing", there's a lot of video game mileage out of simply policing the alternate dimensions alone. The film often hints that fellow agents have been following Yu Law from all the dimensions he escapes to to kill his next lookalike. So there are various ways a game could work:
1) The character would control Yu Law, the bad Jet Li, as he travels dimensions to kill his copy. Each new dimension would have its own rules, its own Jet Li to contend with not to mention the agents that are always on your tail. While Yu Law would have the advantages of his advanced technology and the element of surprise, they would be fairly minute compared to the odds stacked against him. While people might not always like playing the bad guy, this idea makes the most sense of any I can think of, as it not only allows for the most interesting gameplay but the act of killing a different version of himself can "level up" Yu Law, allowing players to choose how he develops and becomes more powerful. Skills and stat boosts can come from each new casualty, but these boosts are also given to the next Jet Li clone which you'll meet. An endless series of Jet Li lookalike bosses, each gaining in power as you do.
2) The character would control one of the agents after Yu Law, probably the one played by Jason Stratham in the movie. They would monitor the dimensions, receive word when they find out where Yu Law is, and pursue him in whichever dimension he was hiding in. While this mode seems the natural course for a game to take (they can just as easily assume a non-movie character with the same task of bringing Yu Law down), it would mean letting Yu Law get away each time after he had successfully killed his double until the very last level. This repeating failure would get rather frustrating after a while.
3) The character would control Gabe Law, the good Jet Li and the only remaining double besides Yu Law himself. In this case, his first mission would be to remove Yu Law (and place him in the prison dimension) like the end of the movie, at which point the rest of the game can continue with even bigger and more apocalyptic dangers for the new dimension-travelling agent to contend with (invented, of course), perhaps finishing the game with a second bout with his battle-hardened and even more dangerous twin.
Of course, you could always centre the game entirely around the events of the movie itself like so many licenses opt to do, but you would be largely ignoring the only interesting aspect of the movie: travelling the multiverse with all its varied sights and dangers.
In conclusion, this kind of idea could also work equally well for a game based on Sliders, or any game that uses a dimension-travelling aspect. Travelling between dimensions is probably the best and most logical way for a game to give each level such a wide disparity from the last. One version of Earth could be calm and peaceful, though actually being full of fascist security troops and security technology so that people too scared to put a foot wrong (in which case it would be difficult to kill someone). The next could take place in the same city but with 24-hour rioting, which would provide a problem for anyone to find their target. Dimensions could be very technologically behind or, adversely, very advanced: the dimension that discovered the multiverse may have just gotten lucky, and so it stands to reason that there could be versions of Earth which are much more futuristic (maybe space-faring) and have no inkling of the multiverse.
So anyway, dimension travelling - though farfetched - as always appealed to me more in a creative sense than, say, time-travelling or moving through space from one planet to another. Those last two can allow for some interesting concepts themselves, but have both been overdone way too much recently in games considering the likes of Kingdom Hearts, Meteos or Timesplitters. Using the same world reshaped differently each time you step through a portal would be intriguing for both players and designers as they figure out how this version of Earth is different, but would also save time on making an entirely new world for each level. Which, while parsimonious, would certainly have enough merit for any games designer to consider.
