Miles -- a 5-year-old who fought leukemia -- is a superhero in San Francisco on Friday.
The San Francisco Chronicle printed a special eidtion just for Batkid.
The city of San Francisco transformed into Gotham to help Miles be Batkid for a day.
Crowds gather in front of a former bank vault waiting for Batkid.
5-year-old leukemia survivor Miles, also known as BatKid exits his cave at Union Square .
A San Francisco police officer on bike escorts Batkid.
Police escorts 5-year-old leukemia survivor Miles, also known as Batkid