It’s not giving away too much to explain that the futuristic technology (which is imagined thinly but with verve) involves a “Naviband,” a device strapped to Kitai’s forearm that allows Cypher to see everything taking place around the young man and to communicate with him-in effect, a super cell phone-and that the drama kicks into high gear when it’s disabled and Kitai has to make his way through Earth’s dangers on his own. Cypher broke both of his legs, and so Kitai must make the journey alone. Cypher and Kitai, apparently the only survivors, need to send a rescue signal with a special transmitter that’s in the tail of the shattered craft, a hundred kilometres away. Father and son are passengers on a flight to another planet when their spacecraft gets caught in an asteroid storm and is forced to crash-land on Earth. His son, Kitai, a cadet seeking promotion to ranger, only aspires to it. Only those who have no fear have a chance of slaying an Ursa that phenomenon of undetectable fearlessness is called “ghosting.” Will Smith, as the military commander Cypher Raige, has it. Mankind’s main obstacle is a monster race, called Ursa, which is blind and detects its human prey by smell-literally, by the scent of fear, as it emerges in the form of pheromones. The action is set a thousand years after humanity had to evacuate a despoiled Earth for a distant solar system, to which the species has adapted. Though set millennia in the future, “After Earth” is very much about life today-an allegory of the transition from being a helicopter parent to a free-range one-and it introduces an impressive array of futuristic paraphernalia to make the point. He also stars in the movie, along with his son, Jaden, and the parental connection is not incidental. Night Shyamalan and Gary Whitta wrote the screenplay for “After Earth,” but Will Smith wrote the story.

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