Captain Stacy's 1st Appearance - Amazing Spider-Man #56 (1968)

Another legendary character, Captain George Stacy, makes their first appearance (it's just a board meeting though).  But in the main story of this issue, Spider-Man has no memory of who he is, so he just helps out Doctor Octopus. What ensues is Spidey constantly fighting the urge to punch Ock in the face, Jonah finally able to say he was right and Gwen realizing maybe she does have a thing for Peter.