Hartley Rathaway (Earth-1: Pre-Crisis)

"Being scooped up by a guy clad in head-to-toe leather's a long-time fantasy of mine, so thanks."

- Hartley Rathaway to The Flash

Hartley Rathaway self-styled as Pied Piper, was the son of Rachel and Osgood Rathaway, a former employee of S.T.A.R. Labs, He was fired by Harrison Wells for trying to stop the activation of the particle accelerator, which he'd discovered was at risk of exploding. After being affected by the particle accelerator and gaining the ability to hear at superhuman levels, Hartley attempted to get revenge on Wells for firing him by trying to kill Barry Allen/The Flash, believing Wells to have replaced him with the Flash.

Biography
On December 10, 2019, He was killed along with the rest of the multiverse, by Antimatter.