grant gustin refuses to work with fox
the pilot was picked up with an initial order of thirteen episodes and the series premiered on october 7 2014 with 4
 in august 2021 it was announced that the guest appearances for the armageddon event would include tom cavanagh as eobard thawne  reverseflash javicia leslie as batwoman brandon routh as  the atom cress williams as jefferson pierce  black lightning chyler leigh as sentinel katherine mcnamara as mia queen osric chau as ryan choi and neal mcdonough as damien darhk with tony curran joining the cast as despero shortly after in an undisclosed capacity