"Doctor Who" alum Arthur Darvill is said to be in final talks to play the time traveller called Rip Hunter on the potential new series, reported Aceshowbiz.
Renee is known for her roles on Broadway plays "Big Fish" and "Pippin Hawkgirl". Her Hawkgirl will not be like the ones that have been featured on "Smallville" and some animated series such as "Justice League".
Saunders is depicted as a young woman who is starting to learn that she has been reincarnated over and over again, on the upcoming show. When provoked, her ancient warrior persona manifests itself and her wings sprout out of her back.
The "Arrow/Flash" spin-off will also feature Brandon Routh's Ray/The Atom, Victor Garber's Dr Martin Stein aka half of Firestorm, Wentworth Miller's Leonard Snart/Captain Cold and Caity Lotz's Sara Lance/Canary.