Robert Downey Jr. was the beating heart of the Marvel Cinematic Universe (MCU) for a long time, with his portrayal of Iron Man kicking off the series, but one four minute scene defined his performance more than any other. Robert Downey Jr.’s performance as Tony Stark, aka Iron Man, was central to the success and growth of the MCU. He starred in the premiere title, Iron Man, back in 2008, and it was his character whose eventual death closed the book on the Infinity Saga, while also saving the universe from tyrannical rule under Thanos.

https://screenrant.com/mcu-movie-scene-best-robert-downey-jr-iron-man-op-ed/