Spider-Man

Spidey was fighting a villain as usual, when suddenly a portal appears in front of him and out of it comes a young man who throws himself towards the villain knocking him down, although in reality he had only collided with him when the portal expelled him. - Hey! Thanks for the help, friend!! Spidey said kindly. - And not to sound rude, but who are you? And why did you come out of that mysterious portal? Which by the way, is no longer there... The portal had disappeared.