Answer: The Last Airbender (2010)
This tagline is from "The Last Airbender", a convoluted tale involving Avatars trying to save the last Earth Kingdom by thwarting the Fire Nation from enslaving the Water Tribes. The four nations in the movie are the Fire Nation, the Water Tribes, the Earth Kingdom and the Air Nomads. If one nation eliminates the others, they won't have a shared destiny. If they can find a peaceful way to coexist, the shared destiny will be achieved. That's a pretty lofty tagline for a pedestrian and confusing movie! With a running time of 103 minutes, it seems a lot longer. Starring Dev Patel, Noah Ringer and Jackson Rathbone, this movie is hard to follow, and even harder to care about.
The other three choices listed are also Shyamalan films. "Signs" stars Mel Gibson and Joaquin Phoenix, and is suspenseful tale of mysterious crop circles that could be signs of something.
"Lady in the Water" is another muddled mess starring Bryce Dallas Howard and Paul Giamatti. It involves a writer, played by Shyamalan himself, a swimming pool, and a lady in the water, played by Howard. The twist is easy to guess and this isn't one of the director's best efforts.
My favorite film of Shyamalan's, by far, is "The Sixth Sense". Bruce Willis and Haley Joel Osment are wonderful in this tale of a boy who can see dead people and the psychologist who tries to help him cope.