After the death of the distant planet Lorien, a spaceship was sent to Earth with ten children and their mentors, who had to hide from their enemies, the Mogadorians, for many years in order to someday return to Lorien and restore the planet. After the first open conflict with the Mogadorians on Earth, in which his mentor is killed, John Smith decides to find the remaining messengers of Lorien in order to unite and defeat evil together. However, it turns out to be not so simple: the Mogadorians are on his heels, he is on the federal wanted list, and his only close person unexpectedly betrays him.