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His Robin is an utter delight <em>and</em> the key to the movie's success.

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Sorry if this has been brought up before, but I think a live action Will Arnett/Michael Cera Batman & Robin could work. : r/batman

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Michael Cera to voice Robin in 'The Lego Batman Movie

Michael Cera & Zach Galifianakis Hilarious THE LEGO BATMAN MOVIE Interview

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Review: 'LEGO Batman' may be best Caped Crusader flick ever