Born with a partially developed right arm, seven-year-old Alex knew he’d be getting a robotic helper soon. What he didn’t know was that it would be fit for a superhero and presented by none other than Tony Stark himself.

Albert Manero, an engineer at the University of Central Florida who creates 3D-printed bionic arms for children, teamed up with Microsoft and ‘Iron Man’ actor Robert Downey Jr. to make the presentation of Alex’s new arm very special.

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The best part? Downey stayed in character the entire time, as Iron Man’s alter ego Tony Stark.

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, said Downey

In an effort to make Alex feel a bit more relaxed (he looks rather starstruck in the video), the actor offered to try on his own robotic arm at the same time – and gave the seven-year-old a friendly fist bump. Downey even joked that the arm he “designed” has glitches, but said he keeps working on it, just like Albert Manero.

The fully operational, custom-fitted bionic limb is the product of Limbitless Solutions, Manero’s volunteer non-profit.

My parents always encouraged me to use my education to help others and to dream big dreams. Now I want to inspire others to help engineer hope for the world. Manero recently told Microsoft’s Collective Project.