To a very special young fan, actor Robert Downey Jr. is a real-life superhero. 

This past weekend, Downey delivered a special surprise to 7-year-old Alex Pring in Georgia. The little boy, who loves superheroes, was born with a partially developed right arm. 

In a video that's going viral, Alex walks into a room to find Downey, as his “Iron Man” alter ego. 

The Hollywood superstar praised the boy's red bowtie, before showing him what was inside the Stark Industries metal cases.  

He then presented Alex with a bionic 3D printed arm, specially made for the boy. 

“[I] had the absolute privilege of presenting a brand spanking new 3D-printed bionic ‘Iron Man’ arm to Alex, the most dapper 7-year-old I’ve ever met,” Downey wrote on Facebook. 

The bionic arm was provided at no cost to Alex's family thanks to Albert Manero, a student at the University of Central Florida.

Manero is the senior director of Limbitless Solutions, a volunteer organization that designs open-source 3D-printed limbs and donates them to children in need. The group was recently recognized by Microsoft's OneNote team's Collective Project campaign.

Downey also thanked Manero and Microsoft “for their work making artificial limbs like this more affordable for families with kids who want to show the playground how badass they are.”

Watch the heartwarming video of Alex being surprised below.

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