Summary: Years earlier on Earth-2, a young Hunter Zolomon watches as his father murders his mother and is subsequently sent to the local orphanage. In present day, Barry tests the tachyon accelerator and is able to enhance his speed four times greater than normal. Barry decides to re-open a breach back to Earth-2, and he believes that Cisco's powers are the key to opening the portals. Meanwhile, Wells recounts how the particle accelerator explosion on his Earth created Zoom. Zolomon was a convicted serial killer as an adult, who was receiving electroconvulsive therapy during the explosion, during which he received his powers. Cisco opens a breach and Zoom immediately comes through, chasing Barry back to S.T.A.R. Labs. There, Barry uses images of Zoom's parents as a distraction to trap him, but Zoom manages to escape, claiming to be "the darkness". Zoom kidnaps Wally and demands Barry's speed in exchange for Wally's life. Barry agrees, so Wells siphons all of his speed force, leaving Barry powerless. Zoom injects the speed force into himself, and he kidnaps Caitlin with his enhanced speed, before escaping.
