In the future world, stupid human civilization will make the earth's environment deteriorate day by day, and the warm and sweet hometown will become full of disaster and death purgatory. Since then, humans travel through space to build a new home in the first nova, and the alien-controlled monster Ursa carried out a brutal slaughter of this group of outsiders. Severidge (will Smith Will Smith), the supreme commander of the Rangers, known as the "original ghost", led his men to effectively stop the slaughter of the enemy. Although the tiger father does not have a dog son, Cypher's son Kitai (Jayden Smith Jaden Smith) fails in the Ranger test. Richie, who had an estrangement in his heart, set out for the Ifetus training base, but was forced to land on a familiar and unfamiliar earth. The violent collision killed almost all the crew, and the Ritchie and son became the only survivors. When his father was seriously injured, Kitai had to look for the signal to survive on his own. For this child who has never grown up, he will face the most important test in his life.