Batkid has taken Gotham, and the Internet, by storm.
Five-year-old Miles lived out the dream of a lifetime as he became "Batkid" for a day in San Francisco on Friday, with the help of The Make-A-Wish Foundation.
Diagnosed with leukemia at 18 months old, the boy ended his treatments in June and is now in remission, which is by far the most important part of the story.
What followed was awesome, though.
San Francisco turned itself into Gotham City, and thousands of bystanders cheered as Miles saved the city from some of Batman's iconic adversaries.
The Make-A-Wish Greater Bay Area chapter outlined several crimes that Miles was asked to solve before being celebrated at a ceremony hosted by the mayor.
Batkid's crime-fighting spectacle made national news, and some big stars shared their reactions on social media. Here are some of the many celebrity responses ...
Ben Affleck: Batkid. Best Batman ever. #SFBatKid #MakeAWish @SFWish
President Barack Obama: Way to go Miles, way to save Gotham! #FollowFriday RT @SFWish: Here he comes!!!! #SFBatkid