The title for this section is not meant to be misleading, but due to the fact that the initial story for the Green Goblin was a mystery identity, the villain's alter ego was intentionally hidden. Thus, the Goblin had been around in the Spider-Verse roughly two years (real time) before Norman Osborn ever made his debut in Amazing Spider-Man. And when he was finally introduced, it was not at all obvious that he was the Green Goblin as well. In the retconned stories like Untold Tales of Spider-Man, the Green Goblin is revealed to be Norman Osborn earlier in his character timeline. However, Norman's first recognized comic book appearance was in June of 1966 in Amazing Spider-Man #37.
But before beginning the official synopsis, there are some unofficial occurences that are a part of the Spider-Man mythos and are worth mentioning. It's possible that artist Steve Ditko may have included Norman (or at least the character that would later be known as Norman Osborn) in the background in a handful of scenes from Amazing Spider-Man #2, #23, #25, #26, #27. These cameos depict Norman as a member of J. Jonah Jameson's social group at his country club, a likely hangout for a wealthy industrialist like Osborn. Moreover, subsequent stories involving Osborn and Jameson have revealed that they were indeed members of the same club and that they had been associates for some time. Another important note is that the initial connection between Norman Osborn and Peter Parker is through Norman's son Harry, a friend of Peter's from Empire State University. Harry is first introduced in Amazing Spider-Man #31, along with Gwen Stacy, a future love interest of Peter.
At the conclusion of Amazing Spider-Man #27, the Green Goblin claims that he is going to lay low for a while and wait for the best time to strike against Spider-Man. So its very ironic that when Norman Osborn is introduced into the Spider-Verse, his life is actually saved by Spider-Man! Amazing Spider-Man #37 features the criminal mastermind known as the Robot Master. And there is more to the Robot Master than meets the eye, for he is Mendel Stromm, Norman’s former business partner. The same man Osborn had arrested for embezzlement ten years before. The story commences with Stromm being released from prison and making good on his vendetta against Norman. He constructs a robot and sends it off to destroy one of Norman's electronics plants. Stromm is controlling and directing the robot while he remains safely in his laboratory. Spider-Man intervenes and stops the robot, but not after it completely destroys Osborn's property. One look at his destroyed plant and Norman is convinced that his ex-partner has returned seeking vengeance. Stromm then sends a second robot directly after Norman, but once again Spidey arrives to save Osborn. However, while Spider-Man is distracted by the robot, Norman delivers a blow to his blind side. Norman then leaves Spider-Man behind to be killed by the robot, but Spidey is able to recover quickly and he eventually corners Stromm. The vulnerable Stromm admits defeat and goes on to say "There's something I must tell you! Something nobody knows about…". But then, a gunshot is fired from the window and the shock causes Stromm to collapse, he dies shorty after from a heart attack. As Spider-Man goes to investigate the origin of the gunshot, he realizes that the shooter was at least two stories in the air. Clearly someone with some serious capabilities pulled that off, but who? We later learn that it was Norman who fired the shot as he ponders to himself, “Spider-Man almost ruined everything for me…and he must be disposed of.”
Norman's next appearance comes in the subsequent issue, Amazing Spider-Man #38. Norman is featured only briefly in this story. However when we do see Norman, his personal vendetta with Spider-Man is still very much on his mind. After putting on a disguise, he approaches a gang and offers them a reward to finish off Spider-Man. He then pays them half of the money (literally, he's the cut the bills in half so that they are worthless until the job is complete). This initiates a wave of reward-seeking gangsters that attack Spider-Man. But Spidey has no trouble thwarting all of their attempts. Norman will soon resolve to handling Spider-Man himself, the only way to get things done right. The battle between the Green Goblin and Spider-Man is about to get personal.
There are some confusing elements to Norman's earliest appearances in the Spider-Verse. At the conclusion of Amazing Spider-Man #37, Norman states that "Spider-Man must be dealt with". If he was the Green Goblin, shouldn't he have already known that? Is it possible that Norman is unaware that he is also the Green Goblin? If that's the case, why? Is he experiencing some kind of weird amnesia similar to his later Goblin appearances where he forgets everything? If he is able to knock out Spider-Man with just his fists, clearly he has some kind of super strength, is he consciously aware of it? What was Stromm going to tell Spider-Man? Did Norman confide in him at some point and reveal that he was the Green Goblin to Stromm? Or did he decieve Stromm and reveal the Goblin identity to be Jameson (similar to what he did with the Crime Master)? Why is somebody with the capabilities of the Green Goblin paying gangsters to handle his dirty work? Is it some kind of diversion? Occam's razor would suggest that all this confusion basically suggests that Norman was not intended to be the Green Goblin when he was first introduced. However, it is clear that there was an intentional mystique placed around Norman. For instance, the fact that he was able to fire at Mendel from that height must have required some super power, or perhaps a Goblin Glider. Goblin or not, Norman Osborn was certainly a shady individual. A shady individual who was beginning to develop an obsession with the wall crawler.
One of Norman's unofficial appearances prior to his official introduction, as seen in Amazing Spider-Man #23
Norman's last unofficial appearance, as seen in Amazing Spider-Man #27
Norman under attack by Stromm's robots, as seen in Amazing Spider-Man #37
Norman blindsides Spider-Man after Spidey had just saved him, as seen in Amazing Spider-Man #37
Spidey confronts Mendel Stromm as Norman prepares to shoot his former partner, as seen in Amazing Spider-Man #37
Norman offers up cash to mobsters to "finish off" Spider-Man, as seen in Amazing Spider-Man #38