Plot: In Las Vegas, regenerated ex-con Jack Bruno works as a taxi driver. During a UFO Convention at Planet Hollywood, the skeptical Jack picks up Dr. Alex Friedman, who will present a scientific lecture at the event. Then he is pressed by two henchmen of his former boss, the criminal Wolff, who wants to talk to him, but Jack does not want to return to the crime life. Jack fights and gets rid of them; out of the blue, he finds two teenagers on the backseat of his cab. They say they are siblings, Sara and Seth, and they need to travel to a location outside Las Vegas in the middle of nowhere. Meanwhile, the government finds a spacecraft that crashed near Las Vegas and chases the two aliens; after the investigation of the men of Major Henry Burke, they discover that the two siblings are the aliens. Jack Bruno, Sara and Seth are chased by Henry Burke's team and by "Syphon", a killer from outer space sent to kill them by their planet's military that wants to invade Earth. Sara and Seth explain that they traveled to Earth to collect scientific data of an experiment and save Earth from invasion, but they need to return immediately to their planet. Jack teams up with Dr. Alex to retrieve their spacecraft in a secret base in Witch Mountain.
Alternative Plot: Jack Bruno (Dwayne Johnson), a Las Vegas taxi driver, is swept up in the adventure of a lifetime when he meets Sara (AnnaSophia Robb) and Seth (Alexander Ludwig), a pair of extraterrestrial youths who possess paranormal powers. In order to prevent an invasion of Earth, Jack must help the youths reach their spaceship, which is buried within Witch Mountain. But the task will not be easy, for government operatives and an alien bounty hunter are fast on their trail.
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