After a bus of innocent people is buried under a rock-slide in Pakistan, The Flash is the one to save them. Unfortunately, his efforts there cause him to miss out on an attack by the Reverse-Flash, back home in Central City. Having already learned about his time-losses, he has developed a method for calculating the time he will lose by expending Speed Force energy. With four minutes lost on his trip back, Barry worries just how many people Daniel West will kill before he finally arrives. Back in Central City, though, another Barry Allen is already there, pummeling the Reverse-Flash. He explains that he has come from the future to prevent Daniel from making yet another huge mistake with his life. Today's events will result in the death of Daniel's nephew Wally and Iris West's permanent conf