Eobard Thawne (Arrowverse)

"You look so young. And I could kill you right now. So easy. What I wouldn't have given… all those times before to have had you like this. So… helpless. But fate… fate's tricky, isn't it? I come here to destroy you… and then to get home I have to be the one who creates you. But I will say… its been an education… watching you grow up all these years, science fairs and soccer games. No hint, no sign, no trace of the man you will be one day for whom I have nothing but hate. And to be clear, nothing is forgiven. There will be a reckoning. I promise you, Barry Allen… that you will die"

- Eobard Thawne swearing to kill Barry Allen once he's filled his purpose to get him home

"Forgive me, but to me you've been dead for centuries."

- Eobard Thawne after killing Cisco Ramon

Eobard Thawne, otherwise known as Harrison Wells and the Reverse-Flash, ips the main antagonist in the first season of The CW's television series ''The Flash. ''Throughout season 1, he is portrayed by actor Tom Cavanagh.

Overview
Hailing from the distant future, Professor Eobard Thawne was once obsessed with the 21st Century's Flash. He went so far as to duplicate the reaction that gave the Flash his powers and became a speedster as well. But when Thawne traveled back in time to meet the Flash, he discovered that he was destined to become his archenemy. Thus, Eobard grew to despise the Flash, and became the reverse of everything he stood for as the Reverse-Flash. And after discovering the exact time era when the Flash was active, Eobard learned the Flash's true identity of Barry Allen. The Reverse-Flash then traveled back in time to kill his nemesis as a child, but this attempt was foiled by Barry's future counterpart. So instead, Eobard murdered his mother, Nora, and framed his father, Henry, instead, in the hopes that Barry would be traumatized enough to prevent him achieving his destiny, an action which alters the entire timeline. Shortly after however, Eobard lost his connection to the Speed Force and was marooned in the 21st century.

Seeking to return to his time, Eobard kills and impersonates Dr. Harrison Wells, the man responsible for creating the Flash in the original timeline. He then founds S.T.A.R. Labs in order to create the Flash himself, by creating a particle accelerator which gives Barry his powers in the year 2014. This way, Eobard could use the Flash's connection to the Speed Force as a means to return to his own time. After the "accident", Eobard fakes paralyses and aids Barry in his missions to stop the other metahuman criminals created by the particle accelerator explosion. However, his secret is ultimately revealed, and after Barry foils Eobard's plot. Eobard is then erased from existance when his ancestor Eddie kills himself to stop Eobard from ever being born.