In October 2014, it was announced that Will Arnett was set to reprise his role in the Lego Batman spin-off film, which Chris McKay would direct for a 2017 release [REF].
On July 16, 2015, The Hollywood Reporter reported that Arnett's Arrested Development co-star Michael Cera was set to voice Robin, while Dan Lin, Roy Lee, Phil Lord and Christopher Miller were announced as producers [REF].