Five-year-old Miles wanted to be Batman. And he has the credentials. The boy has been fighting lymphoblastic leukemia since he was first diagnosed at 20 months and he has secured numerous victories against the disease. On Friday, with his cancer in remission, Miles went on a complex adventure to save San Francisco as the caped crusader.

What started as a simple appeal from the Make-A-Wish Foundation for volunteers to help make the little boy’s dream of fighting crime a reality, has turned into a city-wide day of celebration, with thousands joining in. Friday saw Miles take a tour of the city, defending the innocent, rescuing a damsel in distress and fighting villains like the Riddler and the Penguin at various locations across the city. The masked defender was aided in his valiant efforts by Police Chief Greg Suhr, who stepped in as Commissioner Gordon to alert Miles when he was needed. After Batboy had defeated all of his foes, he was presented with the key to the city by the mayor. The entire event was organized by Patricia Wilson, the Make-A-Wish’s coordinating director for the Bay Area.

"I thought I could do it on a scale that a 5-year-old would appreciate," said Wilson, whose foundation specializes in granting wishes to children with serious diseases. "But apparently, it's on a scale now that the nation appreciates.

"I've never seen anything go viral like this, with the outpouring of support from across the world," she said for the SFGate.

Even President Obama weighed in on Batkid's heroics.