Flash: Back to Normal

"Back to Normal" is the nineteenth episode of season two of the live-action superhero fantasy series The Flash and the forty-second episode of the series overall. It was directed by John F. Showalter with a script written by Brooke Roberts and Katherine Walczak. It first aired on Tuesday, April 26th, 2016 at 8:00 pm.

Synopsis
A metahuman named Griffin Grey wants revenge on Harrison Wells for turning him into a super-strong mutation with accelerated aging. He abducts Harry Wells, believing him to be the same man responsible for the particle accelerator explosion.

Barry Allen meanwhile, must now adjust to living in a world without super-powers, and must rely upon his wits as a forensics investigator to solve meta-crimes. Cisco Ramon helps maintain the illusion that the Flash is still active in Central City with a carefully constructed holographic likeness of the Scarlet Speedster.

On Earth-Two, Caitlin Snow meets her evil doppelganger, Killer Frost. The two conspire to find a way to escape from Zoom's mountain cavern. And the mysterious man in the iron mask continues rapping on the glass.