The CW's adaptation of one of DC's most iconic superheroes returns to Sky One this week and the stakes have never been higher. There’s no doubt that season 6 of the adrenaline-filled series sees the team face their biggest threat yet - one that could destroy all of Central City. And this episode has plenty of action in store. Barry’s work to build the artificial Speed Force is interrupted by the arrival of another Godspeed, who uses vibrational ‘thunder’ to extract speed from Barry. Barry turns to Hartley Rathaway for help. But things quickly get tense, when Barry realises one of the changes from Crisis is that the Flash and Pied Piper are now enemies. Meanwhile, Iris tries to escape the Mirrorverse. The Flash - Tuesday 9:00pm on Sky One.