Batkid Begins tells the story of 5-year old Miles Scott who has spent half his life battling leukemia. Now, it’s his wish to transform into BatKid. San Francisco’s Make-a-Wish thinks bigger. Why not turn San Francisco into Gotham City. Then the idea goes viral. Will it overwhelm Miles, Make-a-Wish, and the city or will the good of humanity make this into a day to remember for millions?