Watch the lovely moment Robert Downey Jr. surprises this young boy with a bionic arm

It looks like Iron Man has a new sidekick in the making: a seven-year-old boy with a new bionic arm.

Alex is "a seven-year-old boy who loves superheroes and riding his bike". Alex was also born with a partially developed right arm.

In the video below he meets Albert Manero, who builds and donates low-cost, 3D printed bionic limbs to children around the world.