How many movies have Andy Serkis and Joe Letteri collaborated on?

They have worked on 9 movies together! Their first movie together was The Lord of the Rings: The Two Towers (2002) while their highest rated movie together was The Lord of the Rings: The Return of the King (2003). They have not worked together since War for the Planet of the Apes (2017). They are most known for their action films together.

Crew
Second Unit Director
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Animation Supervisor
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Visual Effects Supervisor
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Gollum
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Visual Effects Supervisor
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Second Unit Director
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Captain Haddock / Sir Francis Haddock (voice)
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Senior Visual Effects Supervisor
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Caesar
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Senior Visual Effects Supervisor
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Kong / Lumpy
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Senior Visual Effects Supervisor
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Gollum / Smeagol
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Visual Effects Supervisor