A young girl disappears under mysterious circumstances. She returns, but her mother notices that something is wrong.

An asteroid shower lands in a remote section of the Grand Canyon and begins to spread mysterious pods. Meanwhile, scientists on a space station that has been hit by the same asteroid shower, discover that a pod has mutated into a creature and is threatening the ship. Now the scientists and a team on Earth must learn to defeat this alien force, fighting fire with fire, fighting stone with stone.