TODAY | November 14, 2013
>> great story. when charles was a kid, he was a huge batman fan of the tv show . now he has turned that fondness and the famous batman mobile for kids to feel like superheros. yeah, let's give it up.
>> he started with a venture not realizing he is on one. this 4-year-old has become a replica for the 1960s cult classic .
>> hol ibatman.
>> there is a signature batmobile, owned by a phoenix man with an obsession with the television show of his youth.
>> i didn't want to be the guy who owned a batmobile and i have one and you don't.
>> at first, keller offered rides in the batmobile for terminally ill children, then took it further, sinking his own money into a bat cave . hundreds have visited. but ezra is the first who told make a wish he wanted to be batman for a day.
>> joker sighted, reported in proximity of bat cave .
>> it's a child's fantasy come to life. he and his dad must step in as batman and robin .
>> that's me, batman.
>> batman, are you ready for your mission?
>> we'll get them all. look at them all, holy smokes . oh, oh, oh.
>> reporter: when the batmobile reaches the stage, he needs to save a girl scout troop from the joker. it's now more than one man's mix. who has come to cheer him on? in a classic dual of good versus evil. chances are, he has never seen one episode of the cult classic . it doesn't matter, for a little boy fighting for his life, today he gets the chance for the fight for someone else.
>> i just wanted to help.
>> reporter: for his parents, watch his son wage his own battle, this is a gift.
>> i know the amazing effort is it happened to my son. i feel really blessed.
>> reporter: for a life prank, his generosity plays for something money can't buy. i saw you watching ezra .
>> deaf, you bet.
>> reporter: there is joy on your face.
>> i learned things early, i can't cure cancer or build a hospital. one thing i can do is create a memory.
>> it's likely to be a long term one. ezra is in remission. he mit fill batman's shoes again, in a time when we could all news another hero.
>> thank you, gotham city .
>> for "today," nbc news, gotham