Building upon Spider-Man’s (Tom Holland) introduction in last year’s “Captain America: Civil War,” which established 15-year-old Peter Parker as a superhero fanboy* who can’t believe he’s been recruited* to play in the major leagues, “Spider-Man: Homecoming” fleshes out that backstory. The opening scene shows Peter vlogging* during, on his way to and from the airport battle in “Civil War,” to which Tony Stark/Iron Man (Robert Downey, Jr.) had brought the previously urban-myth hero caught on YouTube videos. In a flashback set eight years earlier, we meet Adrian Toomes (Michael Keaton) a salvage-company* owner cleaning up at Avengers Tower — the Midtown Manhattan headquarters of the superhero team in “The Avengers” (2012) — following the Battle of New York against alien invaders. Because the battle left “exotic materials” all over, the newly formed federal Department of Damage Control takes over and immediately throws him and his crew off the job.

Toomes, with the help of henchmen* including Mason (Michael Chernus), turns the alien materials into weapons for underground sale and for use in robbery and for raiding Damage Control transports. Eight years down the road, Toomes is a neighborly sociopath* who’s invented a turbine-powered winged flight suit that he wears with an old-fashioned flight jacket with a furred collar like the feathery tufts of vultures*.

Two months after the “Civil War” events, Peter, a sophomore* at the Midtown School of Science & Technology, is antsy* to get back to the big show. He stops smalltime crime, breathlessly reporting each to Stark’s right-hand man, Happy Hogan (Jon Favreau), and one night tries to stop what seems a simple ATM robbery.

But the villains have high-tech weapons, and in the fight a deli* across the street gets burned down. As Hogan doesn’t listen to Peter’s claims, the teen takes it upon himself to learn more about the weapons, stop whoever’s responsible, and prove himself.(SD-Agencies)