Check out the video above featuring Robert Downey Jr. giving a bionic Iron Man arm to a 7-year-old with a partially developed right arm.
RDJ teamed with Albert Manero, a Fulbright scholar and doctoral student in mechanical engineering at the University of Central Florida, who builds low-cost 3D-printed limbs for children around the world.
The arm only cost about $350, compared to higher costing similar limps at around $40,000.
The video shows young Alex beaming with a smile as Robert Downey Jr. presents the arm in Tony Stark-fashion.
Robert Downey Jr. stars in The Avengers: Age Of Ultron out May 1, 2016.