EXCLUSIVE: Five-year-old Miles Scott touched hearts all over the world last November when he donned a cape and cowl to “save” Gotham City – aka, San Francisco – as “Batkid.” Now award-winning filmmaker Dana Nachman (Witch Hunt) is taking his story to the screen in a feature-length crowdfunded documentary (watch the trailer exclusively on Deadline).

The Batkid phenomenon went viral after the Make-a-Wish Foundation staged its most elaborate wish to date: The charity, with the help of The City, President Obama, and thousands of supporters, turned the streets of San Francisco into Gotham City on Nov. 15, 2013. Scott, a leukemia patient now in remission, got to live every superhero-loving child’s fantasy as he played sidekick to the Caped Crusader in a series of staged missions as onlookers cheered him on. It all culminated with Scott receiving the key to the city from Mayor Ed Lee. The entire event sparked more than 400K tweets in 117 countries, among much else social-media attention, and received a Digital Visionary Award from the Producers Guild.

Nachman brought docu Batkid Begins to Comic-Con with a panel presentation Sunday. The project  has raised $45,500 of a $100K goal on Indiegogo to complete the feature. Here’s the Batkid Begins trailer that was just unveiled this morning at the convention: