Ni Kínní 2007, o ti kede wipe Warner Bros. ti bẹwẹ ọkọ-ati-iyawo Duo Michele ati Kieran Mulroney lati kọ a iwe afọwọkọ fun a Justice League fiimu. Awọn iroyin wá ni ayika kanna akoko ti Joss Whedon ká gun-developed iyanu obinrin fiimu ti a fagile, bi daradara bi The Flash, kọ ati darí nipa David S. Goyer. Iroyin titẹ Justice League: Mortal, awọn iwe afọwọkọ nipa Michele ati Kiernan Mulroney ti a gbekalẹ si Warner Bros. ni June 2007, gbigba rere esi, eyi ti o mu ki awọn ile-iṣere lati lẹsẹkẹsẹ fast track gbóògì ni ireti ti ibẹrẹ ti filming ṣaaju ki o to awọn 2007-08 Writers Guild of America.
Ilé-iṣẹ́ Weta