Martin Stein

Professor Martin Stein is a physicist who was the team leader for the F.I.R.E.S.T.O.R.M. project. He co-wrote a paper on it with Jason Rusch. He is also one half of the transmuted metahuman, Firestorm.

Biography
Professor Stein worked as the leader of the F.I.R.E.S.T.O.R.M. project. He co-wrote an 800-page paper regarding the project along with Jason Rusch. Wishing to get help for it, he went to an unspecified source. However, he completely disappeared and was not seen following.

Martin Stein was on the train back to Central City, the same train Barry rode from his trip back from Starling City. They both interacted, discussing the theories of Albert Einstein and Barry's own girlfriend problems.

That night, Martin returned to STAR Labs in the middle of an anti-particle accelerator protest. With the accelerator on, he drops his Firestorm Matrix and the wave (containing Ronnie) hits him, fusing the two together.

One month later, Stein (in Ronnie's body) finds himself trashed. He went back to his wife Clarissa, but she did not recognize him. For the past year, he had been living under hell. Caitlin and Cisco however were persistent finding him, not knowing he was that he was in control of Ronnie's body. They wanted to help him but he refusesd it. Later when The Flash was about to be kIlled by the Reverse-Flash Stein came to his aid by blasting the speedster off of him. He then told Caitlin not to look for him again before flying off. Stein later came to his old colleague Quentin Quale asking him for his help but he ended up losing control of his powers severly buring Quale. Team Flash eventually tracked him down and managed to persuade him to come In thanks to Clarissa. As the team did test on Stein they discovered that his body was becoming unstable and that he would eventually explode. Hearing this Stein traveled as far as he could from the city to avoid harming anyone. Caitlin and Barry tracked him down and tried to prevent him from exploding by putting a device on his chest however it didn't work and Stein exploded with Barry and Caitlin barley escaping the blast.

Trivia

 * In the DC comics, Dr. Martin Stein became one half of the nuclear superhero Firestorm when he was combined with Ronnie Raymond after an explosion at a nuclear facility. Similar to how the Flash tapped in to the Speed Force for his powers, Firestorm used the Firestorm Matrix to transmute elements.