Iron Man's first real suit in the MCU is almost perfectly believable, according to an expert, "except for the arc reactor." After launching the MCU with his first solo movie in 2008, Iron Man's ...

Iron Man & Spider-Man’s MCU Relationship Was Great (But This Part of It Never Made Sense) ... Tony never features a major Arc Reactor in his Spider-Man designs.

Moreover, building an arc reactor is extremely expensive. Instead, Williams designed her suit to run on solar and wind energy, making it special and setting it apart from the Iron Man suit.

Robert Downey Jr.’s Iron Man has not only been the face of the Marvel Cinematic Universe but has been its arc reactor-powered heart. From the self-centered yet brilliant billionaire in 2008’s ...