The CW network has released an extended trailer for its returning series The Flash – Season 4. At the end of season 3, H.R. (Tom Cavanagh) got to be the hero, sacrificing himself in place of Iris West. Barry Allen walk into Speed Force in the guise of his mother. Caitlin Snow/Killer Froze turn down a cure and was left in the middle of the cross-road to face an uncertain future. Actor Tom Felton who played the role of Julian will not return as regular in season 4. Central City speedster torch has been pass to Kid Flash/Wally West. We won’t be seeing Barry Allen at least in the first couple of episodes. New characters that will appear on season 4 includes Blacksmith/Amunet Black played by Katie Sackhoff and Elongated Man/Ralph Dibny played by Hartley Sawyer. The Flash stars Grant Gustin as Barry Allen/The Flash, Candice Patton as Iris West, Danielle Panabaker as Caitlin Snow/Killer Frost, Carlos Valdes as Cisco Ramon/Vibe, Tom Cavanagh as Harrison Wells, Jesse Martin as Detective Joe West and Keiynan Lonsdale as Wally West/Kid Flash. The Flash season 4 will premiere Tuesday 8 pm October 10th. Check out the trailer below.