The Amazing Spider-Man 2

Richard Parker destroyed his research on spiders and genetic mutations because he knew dangerous people were after him. He uploaded the critical data to a satellite server called Roosevelt before the plane crashed, ensuring the research survived even though he destroyed most of it on the ground.

Earlier in the film, it's revealed that Richard's research became the foundation for the genetic experiments at Oscorp.

Peter broke up with Gwen because he promised her dying father, George Stacy, that he would keep her away from the dangers of being Spider-Man. He believed his superhero responsibilities would put Gwen at risk, so he chose to honor that promise despite his feelings for her.

Peter sees George's ghost during a phone call with Gwen, warning him to protect her from the dangers that come with being Spider-Man.

Max Dillon became Electro after an accident at Oscorp involving genetically modified eels. While working as an engineer, he was exposed to the eels' electrical properties during an experiment, transforming him into a living electric generator.

Peter saved Max from an out-of-control OsCorp truck earlier in the film, which inspired Max's obsession with Spider-Man.

Harry Osborn turned into the Green Goblin because he was dying from a terminal illness and desperately needed Spider-Man's blood to cure him. When Spider-Man refused to help, Harry used his father's research at Oscorp to inject himself with the same serum that created the original Green Goblin, transforming into the villain.

Harry's father Norman died from the same illness, and Norman had previously used the Goblin serum on himself.

Harry turned against Peter because Peter refused to give him his blood, which Harry believed was the only cure for his terminal illness. Peter initially didn't reveal his identity as Spider-Man, and when Harry discovered the truth, he felt betrayed and used his new powers as the Green Goblin to attack.

Harry and Peter were childhood friends, but their friendship was strained after Peter discovered Harry's father Norman was conducting illegal experiments.

Gwen Stacy died during a confrontation between Spider-Man and the Green Goblin at a clock tower. Harry, now transformed into the Green Goblin, threw Gwen from the clock tower. While Spider-Man caught her with his web, the sudden stop caused a fatal injury to her neck, killing her.

This tragedy was foreshadowed by George Stacy's warning to Peter about keeping Gwen away from the dangers of being Spider-Man.

Peter abandoned his role as Spider-Man because he was devastated by Gwen's death. He blamed himself for her murder and felt that his responsibilities as a superhero directly led to the tragedy. This grief caused him to retreat from his duties.

Peter's struggle between his promise to George Stacy and his desire to be with Gwen set the emotional groundwork for his withdrawal.

Peter was inspired to return as Spider-Man after reflecting on Gwen's hopeful graduation speech about finding purpose in life's challenges. Her words reminded him that protecting others is what gives his life meaning, and the emergence of new threats like Rhino pushed him back into action.

Gwen's graduation speech was shown earlier, where she encouraged graduates to face their responsibilities despite fear.

Oscorp conducted dangerous genetic experiments, including creating spiders with genetic mutations and hybrid eels, to develop super-soldier technology and weapons. Senior VP Menken secretly planned to eliminate Harry Osborn's control over the company to profit from these projects.

Richard Parker's original research on spiders and genetic mutations was the foundation for these unethical experiments.

Richard Parker was killed by an assassin sent to eliminate him and steal his research. The assassin hijacked the private jet, killed the pilot, and shot Richard's wife Mary during the struggle. Richard ejected the assassin but couldn't prevent the plane from crashing.

Richard's warning about dangerous people wanting his work set up this deadly confrontation.