Celebrities were using Twitter to cheer on the youngster known as Batkid as he saved San Francisco on Friday.
With a little help from the Make-A-Wish Foundation, Miles Scott, a 5-year-old (who is remission from leukemia) took over Gotham City (aka stand-in San Francisco) and dispensed justice.
On Twitter, the pint-sized crime fighter received encouragement from various celebrities, including Jason O'Mara, the actor who is the voice of the same crime fighter in "Justice League: War."
"Big shout out to #MilesScott aka #SFBatKid for saving Gotham City today. From one Batman to another, great job," he Tweeted.
Robbie Amell, who plays an advanced species human trying to help others on The CW's "The Tomorrow People" also had encouraging words for the little tyke.
"Go #SFBatKid Go!!" he wrote.
Here's what other stars were saying about young Miles:
"Devious Maids" star Rebecca Wisocky @rebeccawisocky: Yay for #SFBatKid! ... #ILOVESanFrancisco
"Nashville" actress Kim Williams-Paisley @Kimwilliamspais: LOVE! Next stop Gotham Nashville! We have the bldg!
"Franklin & Bash" actor Kumail Nanjiani @kumailn: My jaw hurts from trying to not cry while watching this. #Batkid.
"Banshee's" Anthony Ruivivar @AnthonyRuivivar: Coolest kid in the world!
"Dancing with the Stars" pro Cheryl Burke @CherylBurke: Holy Batman - what an uplifting story!
Bravo host Andy Cohen @Andy: loving #Batkid and the people of San Francisco today. #WarmFuzzy
"The Newsroom's" Olivia Munn @oliviamunn: I love #Batkid. I'm cheering you on little man!!
-- Jolie Lash
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