The Most Heartwarming Photos of Stars Dressed as Their Superhero Counterparts for a Good Cause

These celebs might just be more heroic than the characters they portrayed on the big screen

ROBERT DOWNEY JR.

Downey channeled his Iron Man alter ego when it came time to meet with Alex, a 7-year-old who was born with a partially developed right arm. The actor was given the honor of presenting the young boy with "a brand-spanking-new 3D-printed bionic Iron Man arm" that matched the star's.