Once upon a time there was a 5-year-old boy named Miles Scott.
Miles had lymphoblastic leukemia, but that didn't stop him from saving a city – and uniting a nation – in November 2013. With a little help from Make-A-Wish, 25,000 friends, and a few famous pals, Miles and his crime-fighting alter-ego, Batkid, saved San Francisco.
On Thursday, Warner Bros. Pictures released the trailer for "Batkid Begins," the upcoming documentary covering Miles's story, and it's guaranteed to tug at every heartstring you have.
Watch the trailer above.