Peter Parker has begun to feel secure in his life and plans to propose to Mary Jane Watson, who has just recently made her Broadwaymusical debut. While Peter and Mary Jane are on a date, a small meteorite crashes nearby, and an extraterrestrial symbiote attaches itself to Peter's moped. Meanwhile, escaped convict Flint Marko falls into a pit of a particle accelerator that fuses his body with the surrounding sand. The result allows him to shapeshift at will, becoming the Sandman. Peter's best friend, Harry Osborn, who seeks vengeance for his father's death, which he believes Peter caused, attacks him using new weapons adapted from the Green Goblin technology his father had left behind. During the scuffle, Harry injures his head and suffers from partial amnesia, making him forget his feud and the fact that Peter is Spider-Man.