SAN FRANCISCO -- San Francisco has transformed into Gotham City for the day as 5-year-old Miles fights Batman's archrivals to fulfill his wish of becoming the famous superhero.

Miles, a kindergartner from Tulelake in Siskiyou County, was diagnosed with leukemia when he was a year old. The cancer is now in remission.

The Make-A-Wish Foundation granted the boy's wish to become Batman for a day. As Batkid, the boy is helping Batman fight against evil throughout the city.

Around 10 a.m., San Francisco police Chief Greg Suhr called Miles to alert him to a damsel in distress tied up on the San Francisco Municipal Railway Powell-Hyde cable car line.

People cheered on the duo at Green and Hyde streets as they emerged from their Batmobiles in full costume.

The duo scrambled to save the damsel, who was facing an oncoming cable car as the crowd yelled "Go Batkid!"

Many wore clothing donning the Batman logo and held signs that read "Help Us Batkid!"

The pair untied the damsel from a green box filled with question marks from the "The Riddler" and continued on to stop the villain from robbing a bank vault at 550 Montgomery St.

Sacramento resident Jessica Harris came from Sacramento on Thursday night to watch the rescue with her son Matthew, who turns 4 later this month.

Harris said Matthew is also a Batman fan and has been counting down the days until their trip to San Francisco.

"It's kind of bittersweet. It's exciting that they're doing this for (Miles' family)," she said.

San Francisco resident Jesse Garcia came to watch the spectacle that was only three blocks away from his home and said it was great to see the community come out to support Miles.

"I think it's phenomenal that kids still believe in superheroes," Garcia said.

Miles had lunch around 12:30 p.m. at the Burger Bar overlooking Union Square and a flash mob performed to Journey's "Don't Stop Believin'."

The group then told Miles that San Francisco Giants mascot Lou Seal had been kidnapped by Batman's other rival "The Penguin," and the boy went to rescue him inside AT&T Park.

Miles will then headed to City Hall and received a key to the city from San Francisco Mayor Ed Lee at 2 p.m.