Special Guest Stars Keiynan Lonsdale as Wallace "Wally" West David Ramsey as John Diggle Sendhil Ramamurthy as Dr. Ramsey Rosso Stephen Amell as Oliver Queen / Arrow Guest Stars Patrick Sabongui as David Singh Carmen Moore as Kristen Kramer Co Starring Vanessa A. Williams as Francine West Shawn Stewart as Mitch Romero