It only took a couple minutes, before it blew up online.
Bat Kid went viral on social media, drawing the attention of millions.
It was the story of 5-year-old Miles Scott who fulfilled his fantasy of being an actual super hero for a day.
The leukemia survivor, became Bat Kid, with the help of the Make-A-Wish Foundation and went on to save civilians from the 'bad guys.'
Celebrities like Ben Affleck tweeted about him, as did US President Barack Obama.
Now a film is being made, showing the behind the scenes story of that day a year ago.
Have a look at the trailer: