My graphic novel style black and white concept art for this character..
The Green Goblin debuted in The Amazing Spider-Man #14.
In the landmark story, "The Night Gwen Stacy Died" (The Amazing Spider-Man #121–122), the Green Goblin kills Gwen Stacy and later perishes in a fight against Spider-Man. However, the story's writer, Gerry Conway, had Harry Osborn adopt the Green Goblin identity in that story's aftermath. Harry Osborn's becoming the Green Goblin was mostly well-received, with fans remarking that Harry was more menacing than his father had ever been.