The Flash is back and faster than ever. Following Savitar's defeat, Barry Sacrifices himself to stabilize the speed force.
In Flash Season 4 Episode 1 we get to see Barry again but it seems he's not the same old Barry. Barry being in the speed force for so long has had some effects on him.
In episode 1, the team try their best to combat foes in Barry's Absence but a particular foe requests for a show down with the Flash himself.