so on friday, the make-a-wish foundation made that dream come true. >> it just makes me so happy that he gets to go and be the hero that he is. >> i'm batman! >> reporter: riding shotgun in a lamborghini-turned-bat mobile, police escorts guide miles through a downtown now transformed into gotham city. first bat kid is rushed to help a damsel in distress tied to cable car tracks. with an assist from his mentor, batman, miles saves the day to everyone's delight. >> he's so cute. >> reporter: but there's no time to rest. the riddler is robbing a bank and bat kid is called to foil those dastardly plans. >> i closed the door on him! >> reporter: every step of the way, huge crowds greet bat kid. some 13,000 complete strangers all packed into downtown san francisco, thanks to social media. >> when i was a kid, i wanted to do this. he's actually getting to do.