How many movies have Andrea Romano and Sam Register collaborated on?

They have worked on 19 movies together! Their first movie together was Wonder Woman (2009) 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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Executive Producer
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Jean Palmer (voice)
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Elderly Atlantean Woman (voice)
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Executive Producer
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Woman (voice)
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Executive Producer
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Other
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Green Lantern's Ring (voice)
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Executive Producer
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Woman / Police Dispatch / Woman #2 (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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Production Manager
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Executive Producer
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News Anchor #2 / Superman's Ship (voice)
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Woman / Police Dispatch (voice)
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Executive Producer
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Bat Computer (voice)
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Executive Producer
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Obstetrician (voice)
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Executive Producer
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Abin Sur's Ring / Deegan's Ring (voice)
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Executive Producer
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Reporter #1 (voice)
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Executive Producer
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Casting
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Giganta / Computer (voice)
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Executive Producer
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Executive Producer
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President's Advisor (voice)