The CW has released an extended trailer for The Flash Season 4 which offers some new footage.
You can watch The Flash extended Season 4 trailer using the player below! The Flash stars Grant Gustin as Barry Allen/The Flash, Candice Patton as Iris West, Danielle Panabaker as Caitlin Snow, Carlos Valdes as Cisco Ramo, Tom Cavanagh as Dr. Harrison Wells, Jesse L. Martin as Detective Joe West, Keiynan Lonsdale as Wally West, and John Wesley Shipp.