Peter Parker, portrayed by Tobey Maguire, is an introverted high school senior living in the bustling city of New York. Following the tragic death of his parents, he resides with his caring Uncle Ben and Aunt May. His heart, however, belongs to his neighbor, Mary Jane Watson, played by Kirsten Dunst, who stands out as one of the few kind souls in his challenging school life. Unfortunately, Peter faces bullying from her boyfriend, Flash, and his friends. The only one who shares his outsider status is Harry Osborn, a wealthy and handsome student; yet, Harry grapples with jealousy over the affection his father, Norman, shows towards Peter. Norman, the head of Oscorp, sees promise in Peter's scientific mind, sometimes wishing he could have had him as a son.
The adventure begins when Peter's science class takes an exciting field trip to a genetics lab at Columbia University, where groundbreaking work with spiders is conducted. While snapping photos of Mary Jane for the school newspaper, a genetically altered spider bites Peter, setting in motion a mysterious transformation within him. Upon returning home feeling ill, Peter experiences extraordinary changes as the spider's venom alters his genetics. Meanwhile, at Oscorp, General Slocum threatens to cut military funding due to instability in their new super-soldier formula. Breaching protocol, Norman subjects himself to the untested formula, which grants him impressive super abilities but drives him to madness, culminating in the death of Dr. Stromm, one of his scientists, and the theft of crucial Oscorp inventions.
The very next day, Peter senses a newfound vigor and strength. His once scrawny frame now exudes muscularity, and he discovers he can shoot webs from Spinnerettes located in his wrists. In a remarkable display of agility, he saves Mary Jane from a lunch mishap and bravely confronts Flash in a brief altercation. As he juggles his budding powers with his feelings for Mary Jane, he notices an ad promising $3,000 for outlasting a local wrestling champion, Bone Saw. He quickly fashions a wrestling costume and sneaks out under the pretense of heading to the library, though his Aunt May is concerned about his changing demeanor.
Despite Uncle Ben's warning that "with great power comes great responsibility," Peter's desire for quick cash drives him into the ring. He triumphs in the match, but is cheated out of his rightful earnings. In a chilling twist of fate, Peter's inaction later leads to the death of Uncle Ben at the hands of a robber he chose not to stop. Devastated, he takes justice into his own hands by tracking down the criminal responsible, setting off a chain of events that reconnects him with his purpose as a hero.
Feeling the weight of Uncle Ben’s lesson, Peter adopts the identity of the Amazing Spider-Man. He embarks on a mission to protect the city despite criticism from J. Jonah Jameson, the forceful publisher of the Daily Bugle, who eventually realizes the profit potential of photos capturing Spider-Man's exploits. As Peter transitions into adulthood, balancing college classes with his newfound vigilance, tensions rise when he learns about the duality of Norman Osborn, who has now embraced his darker persona as the Green Goblin.
The plot thickens when Norman's insanity drives him to commit heinous acts, including an attack on Oscorp’s Unity Day, which puts Mary Jane in jeopardy. In an astounding act of heroism, Spider-Man saves her, igniting a spark of romance between them, despite her ignorance of his true identity. The Goblin, eager to recruit Spider-Man as a partner, stages various threats, ultimately leading to a harrowing choice for Peter when he orchestrates Mary Jane's kidnapping. Torn between saving her and averting disaster, Peter ultimately reveals his true strength and resourcefulness in the face of evil.
In a climactic showdown, Peter discovers Norman’s connection to the Goblin. His conflict escalates as both identities clash, leading to one last confrontation that claims the life of Norman, leaving Peter with the haunting knowledge that he caused the death of a man he once admired. In the aftermath of tragedy, intimate moments with Mary Jane lead to unspoken feelings, signifying the personal sacrifices Peter must make as he embraces his dual life. As he grapples with his dual existence, he realizes his greatest blessing and burden: "Who am I? I'm Spider-Man."
