
In a video posted on Facebook on Thursday, Downey Jr dressed up as his fictional character Tony Stark to deliver a robotic "Iron Man" arm to Alex, who loves superheroes, aceshowbiz.com reported.
Alex was told he was meeting a bionic expert in a hotel room, but he had no idea it would be one of his favourite superhero characters "Iron Man".
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"Nice bow tie, by the way. How were your travels?" Robert told Alex.
Alex replied: "It's very good." Robert then opened two cases, written Stark Industries, with one containing Alex's new arm and another one containing a larger arm for the actor.
Downey Jr. wrote alongside the video: "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."
Can’t resist more pics from the #CollectiveProject. Special thx to Albert Manero, @MSOneNote, & @Marvel. #Limbitless pic.twitter.com/SvSDwMNz20
— Robert Downey Jr (@RobertDowneyJr) March 12, 2015
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