How many movies have Brian Donovan and George Lucas collaborated on?

They have worked on 2 movies together! Their first movie together was Star Wars: Episode II - Attack of the Clones (2002) while their highest rated movie together was Star Wars: Episode III - Revenge of the Sith (2005). They have not worked together since Star Wars: Episode III - Revenge of the Sith (2005).

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Baron Papanoida (uncredited)
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