Earth-3

"Now all I have to do is find my way home. [...] I think you would call it Earth Three."

- Jay Garrick

Earth Three is a universe parallel to Earth One and Earth Two. The name was coined by Jay Garrick. Similar to Earth Two, Earth Three has various features that are anachronistic compared to Earth One, such as the popularity of zeppelins and the Tommy gun.

History
After Hunter Zolomon overdosed on the Velocity drug, he crossed over into this world. He overpowered the Flash of this Earth, and took him back to his Earth to take his speed to heal himself, but for some reason it didn't take, so he imprisoned him and stole his identity to use it to give the people of his Earth hope so he could sickly rip it away.

After Barry released him from his prison, he went back to Earth Two with Harry and Jesse and made his way from there back to his Earth.

The Trickster from this world robbed a bank, and told the citizens inside that if they followed his instructions he'd let them live, but he killed them anyway. CCPD went to apprehend him, but Jay Garrick appeared on the scene first, and the Trickster fired of his Tommy gun, but Jay caught all the bullets in his helmet. Thinking fast, the Trickster cuffed the Flash to him and activated a bomb, but Earth One's Flash appeared and disabled the bomb, bound the Trickster, and the police arrived and took him into custody.

Residents

 * Jay Garrick/The Flash
 * Jay Garrick's mother
 * The Trickster

From Earth One

 * Barry Allen/The Flash (formerly)

From Earth Two

 * Hunter Zolomon/Zoom (formerly)

Trivia

 * For a while the universe Barry Allen visited on the Supergirl-Flash crossover Worlds Finest, the third known Earth seen, was confused for Earth Three. It was later confirmed in "Invasion!" by Cisco that the Earth Barry visited was Earth Thirty-Eight.