Banshee is attacked by a robot spider and sends a message of warning about a spider to the X-men. The robot has a spy cam and was made by Factor Three actually, but the X-Men find Spider-Man on the same spot from where Banshee had called them, and thought he is a threat. While they battle the Spider-Man (who isn't aware of what is going on), Jean Grey tries to locate Banshee. At the end, they realize Spider-Man wasn't the real threat and then trie to find Banshee, who is still missing.
This is the first team-up of X-Men and Spider-Man.