Spider-Man's origin story summed up: High school kid gets bit by radioactive spider while on field trip, develops ability to climb on services (whether he naturally creates the webbing or invents it and puts it in web shooters varies), uses the extra strength to become wrestler until he lets a robber go who then kills his grandfather, he decides to become a superhero after that. Obviously you know that, so it is a little more complicated but they could sum it up in like 5 minutes tops.