After more than a year of training under Peter Parker, Miles Morales has mastered his superpowers and established himself as the original Spider-Man's crime-fighting partner, though he still struggles to adapt into his new role. While he and Peter escort a police transport carrying prisoners to the rebuilt Raft, Miles accidentally releases several inmates, including Rhino. While trying to stop Rhino's rampage through the city, Peter is knocked unconscious. Miles intervenes to protect him and defeats Rhino with his new bio-electric ability Miles discovers that her brother Rick created Nuform during his work for Roxxon, but soon became sick due to its unstable properties. Phin and Rick sought to expose the dangers of Nuform to the public, but while trying to shut down a Nuform reactor, the latter was killed by Krieger, who subsequently took credit for Nuform's creation. With the help of Aaron as the Prowler, Miles infiltrates a Roxxon lab to retrieve Phin's phone containing evidence of Krieger's crimes, but the phone is destroyed during his escape At Aaron's advice, Miles uses his friendship with Phin to infiltrate the Underground and learn more about their plans. He discovers that Phin created the Underground's advanced weaponry out of a special component, programmable matter, in exchange for their help in exacting revenge on Krieger, which she plans to achieve by sabotaging the Nuform reactor at Roxxon Plaza to destroy it and expose Nuform's dangerous side effects. However, Miles is soon forced to reveal his identity as Spider-Man to Phin in order to save his own life, souring their friendship. While meeting with Phin to try and reconcile with her, the two are captured by Roxxon with the aid of Rhino, whose exosuit has been enhanced by Roxxon tech. Miles and Phin escape, but the former learns that Aaron has been spying on him for Roxxon and that Krieger modified the plaza's Nuform reactor to destroy Harlem if Phin's plan succeeds.