With Arrow and The Flash beginning their runs to the season finale, we're starting to get news on casting for the spin-off series that CW has planned for next season. What do we know? We'll see Captain Cold (Wentworth Miller), The Atom (Brandon Routh), and at least one half of Firestorm in the form of Doctor Martin Stein (Victor Garber). We also know that Caity Lotz will be returning in an unknown role. We also now know that the character Kendra Saunders aka Hawkgirl will be joining the super team! She'll be played by Ciara Renée, a Broadway star and recently made an appearance on Law & Order: SVU.