How many movies have Robert Downey Jr. and William Hurt acted in together?

They have worked on 4 movies together! Their first movie together was The Incredible Hulk (2008) while their highest rated movie together was Avengers: Endgame (2019). They have not worked together since Avengers: Endgame (2019). They are most known for their science fiction films together.

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Tony Stark / Iron Man
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Secretary of State Thaddeus 'Thunderbolt' Ross
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Tony Stark / Iron Man
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Secretary of State Thaddeus 'Thunderbolt' Ross
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Tony Stark / Iron Man
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Secretary of State Thaddeus 'Thunderbolt' Ross
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Tony Stark (uncredited)
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General 'Thunderbolt' Ross