(NBC News) At some point in their life every little boy dreams of being a super hero.
On Friday an entire city of heroes will make one little boy's dream come true.
5-year-old Miles has been battling leukemia.
He's in remission now, and when the Make-A-Wish Foundation asked what would make his recovery a bit easier he said he wanted to be Batman.
It started with a few e-mails, then a few more.
Now thousands have volunteered to turn downtown San Francisco into Gotham City, setting the scene for Miles to rescue someone on a cable car, stop a bank robbery in process and then stop a kidnapping.
"People are flying in, some teachers are bringing their classrooms, I'm overwhelmed," says Patricia Wilson, Executive Director of the Make-A-Wish Foundation for the San Francisco Greater Bay Area.
A super-human effort for a kid who at 5 has already taken-on the toughest villain there is.
"Obviously we'll never replicate this, this is just a moment in time of something goes viral and a city comes alive," Wilson says.