Jay Garrick

An unnamed man is an individual from Earth Two and a current prisoner of Zoom. When Barry Allen was captured by Zoom on Earth Two, he was placed in a cell beside Jesse Quick and the man, who wore a mask and was always knocking on the carbyne of his cell.

Helping the Flash
After continually knocking on the glass of his cell, Barry realized he was trying to tell them something. While Jesse told him to let it go, Barry wanted to figure out his pattern as it may help them escape.

Barry and Jesse eventually realized he was not using Morse code, but a 5x5 tap code commonly used by POW's. The two began to work together and started to decipher his message. Barry and Jesse discovered the first part of his message spells J-A-Y as in Jay Garrick, when Barry says that "Jay" is alive, but not with them, the man becomes distressed. Just as Barry gets the man to calm down enough to try to explain what he means, Zoom runs in and warn the man not to talk to them again and watched in distress as Zoom pummeled Barry.

Eventually Barry and Jesse were rescued by their friends, but before they could help the man, Zoom arrived and endangered them all. While Killer Frost held down Zoom to allow Barry and the others to escape, Barry promised the man that he would return to rescue him. When Zoom returned to his lair with his deceased time remnant, the prisoner was suddenly horrified by his return.

New Inmates
The masked prisoner encountered a new temporary inmate, Wally West, asking where he was. The prisoner attempted to use the same tap code, but Wally didn't understand it. Zoom then spoke to the new prisoner, before speeding off, taking Wally with him, leaving him alone once more.

In the Season 2 episode "Versus Zoom", Barry asks Zoom who the man in the iron mask is. Zoom, interestingly replies, "You wouldn't believe me if I told you."

Caitlin had an encounter with the masked man while he was tapping the glass, but was cut off by her doppelgänger noticing her. Killer Frost said if she could get her powers to work through the wall the first thing she would do would be shutting him up. Caitlin then asked who he was but Killer Frost said she didn't know. She added if he was there Zoom must need something from him.

Season 2

 * "Back to Normal"
 * "Back to Normal"
 * "Back to Normal"
 * "Back to Normal"
 * "Back to Normal"