In Spider-Man: Homecoming, Peter Parker stops Adrian Toomes's plan to steal an Avengers cargo plane, crashes it on Coney Island beach, and saves Toomes's life before turning down Tony Stark's offer to join the Avengers. Spoilers follow.
Toomes and his crew are pushed out of the cleanup job after the Battle of New York. They keep the alien tech and begin building weapons, including a winged flying suit that makes Toomes the Vulture. Eight years later, Peter returns to school after the events of Captain America: Civil War and is told by Tony Stark that he is not ready to join the Avengers. He quits the academic team to patrol as Spider-Man, and Ned learns his secret.
Peter interrupts a weapons sale by Toomes's men, and Toomes drops him in a lake while wearing the Vulture suit. Stark rescues him and tells him to stay away. Soon after, Toomes accidentally kills one of his own crew with a weapon, and another man, Herman Schultz, takes over as Shocker. Peter and Ned study a leftover weapon and trace Schultz toward Maryland, so Peter rejoins the academic team for a tournament in Washington, D.C.
There he is trapped in a truck while chasing Toomes and misses the event. He then races to the Washington Monument, where an unstable alien power core explodes, and he saves classmates trapped in an elevator, including Liz. Days later, Peter catches Toomes's new buyer on the Staten Island Ferry, but a faulty weapon splits the ferry in two. Stark arrives to help save the passengers and takes Peter's suit as punishment.
Peter then invites Liz to the homecoming dance and learns she is Toomes's daughter, and Toomes works out that Peter is Spider-Man. Toomes threatens him, and Peter realizes Toomes plans to hijack a plane carrying Avengers weapons. Peter leaves the dance in his old homemade suit, beats Schultz with Ned's help, and survives being buried under rubble at Toomes's hideout. He stops the plane by crashing it on the beach at Coney Island, then saves Toomes's life when the Vulture suit explodes and hands him to the police. Liz moves away, and Peter turns down Stark's offer to join the Avengers full time.