Everyone knows that some superheroes are made, not born. You don't need to be from another planet or get bitten by anything radioactive to become one — you just need the right gear. In this video from non-profit prosthetic maker Limbitless Solutions, Robert Downey Jr. (aka Iron Man) steps in to demonstrate this first hand. Downey delivers a 3D-printed prosthetic arm modeled after his character's super-powered gauntlets to Alex, a 7-year-old born with a partially developed right arm. There's no Arc Reactor in sight, mind you, but even heroic kids needs to take it slowly when dealing with Iron Man's gear.