How many movies have Mark Ruffalo and Robert Downey Jr. appeared in together?

They have worked on 10 movies together! Their first movie together was Zodiac (2007) while their highest rated movie together was Chadwick Boseman: A Tribute for a King (2020).

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Self - Actor, "Avengers: Endgame" (archive footage)
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Self
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Bruce Banner / Hulk
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Tony Stark / Iron Man
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Bruce Banner / The Hulk
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Tony Stark / Iron Man
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Himself
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Himself
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Bruce Banner / The Hulk
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Tony Stark / Iron Man
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Himself / Bruce Banner / Hulk
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Himself / Tony Stark / Iron Man
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Bruce Banner (uncredited)
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Tony Stark / Iron Man
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Himself
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Himself
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Bruce Banner / The Hulk
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Tony Stark / Iron Man
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Dave Toschi
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Paul Avery