The heroic exploits of 5-year-old Miles Scott are put on display in the second trailer for the upcoming documentary Batkid Begins, debuting in limited theatrical release June 26 before expanding nationwide in July. On November 15, 2013, more than 25,000 fans crowded the streets of San Francisco to cheer on young leukemia patient Miles Scott, as he became Batkid for a day through an inventive Make-A-Wish Foundation event. More than 2 million followed young Miles' day on social media, as he took on The Penguin and The Riddler, saved a damsel in distress and was issued the key to the city by San Francisco mayor Ed Lee.

At first, the Make-A-Wish organizers hoped that at least 200 people would show up for the event, but thousands showed up, some even flying in to show their support for Batkid. Dana Nachman was so moved by the event that she created this documentary to take fans behind the scenes to show how this whole day came together. Here's what she had to say below.

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"That event rocked my world. People saw bits and pieces of this day and fell in love with Miles and the people who made it happen. My goal is to take you behind-the-scenes and see how and why it happened."

The trailer shows interviews with Miles' parents, the Make-A-Wish organizers, and even composer Hans Zimmer, who crafted the Batman theme for Christopher Nolan's trilogy. In addition to the trailer, we also have a new poster showing the Batkid himself, Miles Scott, who is now six years old and cancer-free. Take a look at the new footage from Batkid Begins below.

Batkid Begins Poster