"The Mighty Avengers Meet Spider-Man!" and "Along Came a Spider!" Reprints Avengers (Vol 1) #11. The Avengers are victims of a the villianous Kang, who traps them using a robot of Spider-Man. Only the arrival of the real Spider-Man fouls Kang's plot.
Back-Up Story: Captain America sits down for a heart-to-heart with Spider-Man to determine for himself if the youngster is a hero or villian.