|Real name||Harold Osborn|
|First appearance||"The Amazing Spider-Man #4"|
In High School, Peter told Harry and Gwen that he was Spider-Man. Harry later found out that his father was the Kingpin and he would give Spider-Man information about his father's criminal activities.
Harry later took a dose of the Goblin formula, which gave him super strength. He used it to help Spider-Man take down Kraven the Hunter. He decided not to be a superhero, but he would sometimes use his super strength to help Peter.
When Green Goblin found out about Harry's assisting Spider-Man, he decided to kill him. He impaled him on a blade and left his body to die. It wasn't long after that, that Gwen Stacy died.
Harry's body was snatched by a ninja cult called The Hand. They used magic to resurrect him and his mind was altered. He used his super strength and knives and guns to become Slash. Spider-Man fought him and restored his memory. Spider-Man and Slash then began working together as superheroes. Harry soon started only becoming Slash when Peter absolutely needed him.