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SAN FRANCISCO, Calif. - 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.