Batkid Begins: Documentary explores the viral success of cute Caped Crusader

Everyone's favourite pint-size superhero is back.

Last fall, the world fell in love with Miles Scott, aka Batkid.

Thanks to the efforts of Make-a-Wish Foundation – and the support of 25,000 enthusiastic citizens of Gotham (San Francisco) – the 5-year-old leukemia survivor saved the day and restored order to the city as only a superhero can.

The story of the tiny Caped Crusader went viral, reaching over 2 billion people.

Batkid even had the support of other Batmans:

"I've never been on Twitter, but how great a thing that it can create something like that!" Christian Bale told Vulture. "I mean, wonderful. This little kid, oh my God – what a wonderful day for the little fella! It's just fantastic, seeing all those people who were out there to support it."

Now Miles' story is being made into a documentary, adorably titled "Batkid Begins," directed by Emmy Award-winning director Dana Nachman.

An IndieGoGo campaign is halfway to its funding goal of $100,000. The money will be used to produce a soundtrack and special effects for the film. (Because every superhero film needs special effects.)

According to the fundraising site:

"Now after months of interviewing the key players who made the day possible, Dana will leave the audiences to decide; did Miles need the world for inspiration? Or did the world need Miles?"

The trailer debuted at Comic-Con San Diego.

"One thing that struck me was how many people were holding up signs saying, 'Save Us, Batkid,' and I looked at those signs and I thought, 'You mean that literally,'" Mashable's deputy editor Chris Taylor says in the trailer.

"In helping him to live this dream, we were saving ourselves. We wonder why we're not happy a lot of the time, and it's because we forget this sort of thing. But here was an event that forced us to remember."