RACE TO WATCH MOUNTAIN

Jack Bruno (Dwayne Johnson) is a cab driver in Las Vegas. One of his passengers is Dr. Alex Friedman (Carla Gugino), a failed scientist who is giving speeches about legitimate scientific theories of UFOs and outer space.
The next day, Bruno notices two teenagers, Sara (AnnaSophia Robb) and Seth (Alexander Ludwig) sitting in the back seat of his cab. They tell him they need to go to a certain destination and are willing to pay all they have ($15,000, which they removed from an ATM) to get there. Meanwhile, Major Henry Burke (Ciarán Hinds) is searching for information on the two aliens that landed some days earlier and goes after Jack, realizing the aliens are the teenagers in Jack's car, and after a short chase Seth manages to defeat Burke's car and Jack gets away.
When they arrive at a house on the top of a mountain, Bruno follows them out of concern and curiosity. There, the teenagers retrieve the device they were looking for, contained within alien flora.
When leaving, they are attacked by a "Siphon" (Tom Woodruff, Jr.), a creature built to destroy a certain target. The Siphon pursues them, until its spaceship crashes into a train, the locomotive is destroyed by an explosion in the railroad tunnel, and the creature is wounded. The trio eventually find themselves in a small town. The teenagers explain to Bruno that they are aliens from a distant planet, who are sent to Earth by their parents because the government of their dying planet intends to attack and invade Earth so that their kind may live on there. They also explain that the object they obtained at the house contains the results of an experiment which their parents set up. The research from this experiment will save their planet without having to attack and invade Earth. However their planet's military prefer the idea of invading Earth and arrested their parents for trying to save Earth from invasion and so they decided to complete the mission for them, but the military sent the Siphon assassin to stop them. They are next pursued by government agencies trying to retrieve the teenagers for experiments.
They are joined by Dr. Friedman at the UFO Expo. After a while they go visit Dr. Friedman's best friend "Dr. Donald Harlan" (Garry Marshall) but after explaining he refuses to believe that they're aliens but tells them that the spaceship was taken to a secret government place "Witch Mountain". The group, now including Dr. Friedman, after evading the pursuing government agents, eventually arrive at Witch Mountain. There, the teenagers are captured, along with Bruno and Friedman. The government agents began running tests to try to discover the secret of their powers in attempt to harness them. Burke then plans to kill them and do unspeakable things to them. After a fake surrender to Burke, the two humans escape and come to rescue the teenagers in nick of time. The Siphon causes a distraction by attacking the base, allowing the humans to free the teenagers and reach their ship. They launch the ship, escape through the mountain's tunnels and kill the Siphon who boarded the ship. Once safe, the teenagers drop the humans off, and during a tearful goodbye, give Bruno and Dr. Friedman a device that will allow the teenagers to always find them. As for Burke, whose base is now in ruins, he is left getting questions from Washington. The movie ends with the spaceship taking off and returning to their planet.
During the end credits, Bruno and Dr. Friedman (now in a relationship) are speaking at a UFO convention about their new successful book called "Race to Witch Mountain". As the couple get into their car and are about to leave, the device the teenagers gave Bruno activates, implying that they may return to earth