The Flash Recap: Everything You Missed in "Mother" The Flash, Barry was back in action as the Fastest Man Alive thanks to his Artificial Speed Force, but it came at a price. The thing powering his abilities left him emotionless. He coldly brought Iris back from the Mirrorverse, but at great cost, and destroyed the Artificial Speed Force, leaving himself powerless again. This week, the timing of his loss of speed couldn't be worse with Eva McCulloch ramping up her plans for the world and time running out to not only save Iris but figure out how to somehow bring their lost friends home.