Barry Allen (Earth-90)

"Enough! You will not do to this Earth what you did to mine."

- Barry Allen to The Monitor

Barry Allen is a speedster and the last survivor from Earth Ninety.

The Monitor's test
After an intense battle, Barry Allen was seen dragging himself towards a giant book that glowed with purple energy. Before he could reach it, it was picked up by a very imposing figure in armor named Mar Novu, also known as the Monitor. When Barry asked why he was doing this, Novu said that they had done this to themselves, and now they would perish. He then opened the book, which began to glow, while Barry ran off to escape to another universe.

Attempting to breach to the Monitor's next target, Earth One, Barry managed to open a portal through which he warned Team Arrow and Team Flash about the Book of Destiny, before closing once more.

Sometime later Barry finally succeeded and fully breached through at A.R.G.U.S. He explained that The Monitor was Mar Novu and he had destroyed his world, and he mistook John Diggle with his Earth-Ninety doppelgänger. Just then, the Monitor appeared on TV, so Barry joined the heroes and they set out to try to attack him. During the confrontation, Barry attempted to attack first but the Monitor made him vanish, leaving his fate unknown.

Powers

 * Speed Force connection/Meta-human physiology:  Barry has a connection to the Speed Force, and now possesses powers of incredible speed and superhuman reflexes. This was enough to escape the destruction of his teammates at the hands of Mar Novu.
 * Electrokinesis: Barry produces yellow electricity from his body, commonly seen when running.
 * Superhuman speed: Barry can move at such vast speeds, indeterminable to the naked eye.
 * Interdimensional travel: Barry can travel through universes, as he did this when he travels from Earth Ninety to Earth One.
 * Atmospheric interference: When Barry was attempting to breach to Earth One and to communicate with that Earth's Oliver and Barry, he somehow caused interference at 650 nanometers, the wavelength for infrared, turning the sky to red, accommodated by thunderclouds.

Abilities

 * Expert combatant: Barry fought Mar Novu alongside many other heroes on Earth Ninety, although he was the only one of them that survived.