How many movies have Andrea Romano and Bruce Timm collaborated on?

They have worked on 19 movies together! Their first movie together was Batman: Mask of the Phantasm (1993) while their highest rated movie together was Batman: The Dark Knight Returns (2013). They have not worked together since Justice League: Gods and Monsters (2015). They are most known for their animation films together.

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Casting
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Executive Producer
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Jean Palmer (voice)
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Blockbuster (voice) (uncredited)
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Story
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Woman (voice)
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Characters
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Other
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Woman / Police Dispatch / Woman #2 (voice)
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Thomas Wayne / Hydrant Fireman (voice)
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Executive Producer
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Doris / Central City Newsreader (voice)
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Executive Producer
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Woman #2 (voice)
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Hydrant Fireman (voice)
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Executive Producer
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Woman / Police Dispatch (voice)
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Executive Producer
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Thomas Wayne (voice)
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Bat Computer (voice)
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Ace (voice)
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Executive Producer
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Obstetrician (voice)
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Thug #1 (voice)
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Executive Producer
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Abin Sur's Ring / Deegan's Ring (voice)
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Galius Zed (voice) (uncredited)
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Executive Producer
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Reporter #1 (voice)
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The Riddler (voice)
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Casting
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Producer
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Watchtower Computer, Reporter (voice)
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Executive Producer
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Uncle Super, Captain Super Jr. (voice)
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Giganta / Computer (voice)
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Mongul (voice)
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Executive Producer
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Casting
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Bug Boy (voice)
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Producer
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Producer
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President's Advisor (voice)
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Attacker (voice)
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Martha Wayne / Dispatcher (voice)
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Executive Producer
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Director
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Producer
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Story
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Laughing Boy (voice)
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Screenplay
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Guard (voice)
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Director
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Co-Producer
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Storyboard Designer