By now you've probably heard of BatKid—the alter-ego of five-year-old Miles, a super kid fighting leukemia. He's on a mission today, courtesy of Make-A-Wish, saving San Francisco from the Riddler and Penguin. Watch it unfold live, right here.

The plan to transform San Francisco into Gotham has been unfolding since October, with San Francisco's police chief, City Hall, and thousands of excited volunteers teaming up to make Miles' day. And what a jam-packed day it'll be:

After rescuing a damsel-in-distress from the Hyde Street cable-car tracks in Nob Hill, then capturing the Riddler in the act of robbing a downtown vault, Batkid will enjoy lunch at the Burger Bar, near Union Square. After lunch, he will get a special message from the Police Chief and go to the window where he will look down and see a huge crowd of volunteers jumping up and down pleading for Batkid's help. Why? The villainous Penguin has just kidnapped a famous San Francisco mascot (Lou Seal)! The batmobile will be visible on Union Square, (a convertible offering a view of the crime in progress), and the chase will be on!

After apprehending the Penguin, Batkid will make a final stop at City Hall where the Mayor of San Francisco, Ed Lee, along with the Police Chief, will congratulate him on his daring feats of justice and present him with a key to the city.

We're updating this adventure as BatKid's action-packed day continues.

This little superhero has a packed day ahead of him. Riding along with Batman in a Lamborghini Batmobile, Miles has great backup: his little brother Robin coming along to help. Photo by @pilarwish

Now they're off to chase after the Riddler. Photo by @pilarwish

The Riddler had plans to loot the Financial District. Image via @SFWish

Pow! BatKid gets the Riddler behind bars. Image via abc7newsbayarea

This damsel's not in distress anymore. Image by @NewsBreaker

Thanks, BatKid. Image by @KRON4MPelton

No time to rest. Image by @AP

City Hall awaits its hero. Photo by @lolomacha

Saving Gotham sure works up an appetite. Photo by @abc7newsBayArea

Penguin rides in style too. Image via @jutanclan

Update: The Giants' Lou Seal is free, and the Penguin has been foiled!

Update: After a long day, the Department of Justice is left to deal with the apprehended villains:

...while BatKid gets a shoutout from the Vice President:

And from the President!

The San Francisco Chronicle is marking the day with a special edition worthy of such a hero: