When to Watch: Wednesday, Oct. 9 at 8 p.m. What to Expect: Two words: The. Flash. Yes, the CW hit will be introducing Dr. Brett Allen aka The Flash in season two, with the potential for a spinoff series. Huzzah! Plus, the Black Canary will make her debut, but it won't be Laurel donning the tights; it's her sister, played by Caity Lotz!