Eobard Thawne

Eobard Thawne, also known as the Reverse-Flash, is a time traveler who was born in the year 2151. He time traveled, along with a future version of the Flash, back in time and killed Nora Thomas, Flash's mother though originally he'd meant to kill the Flash's younger self. Before he was able to kill him, future Flash got his younger self out of the house and in a moment of rage Eobard stabbed Nora Thomas instead. Travelling back that far into the past, however, drained the Speed Force within him which prohibited him from being able to return to his future time.

Eobard knew he would need to wait for Kevin to get his powers from the particle accelerator, so he then assumed the body of Harrison Wells, and became the founder of S.T.A.R. Labs. After the particle accelerator he created exploded, he nurtured the past version of Kevin Thomas back to life, assisting him in becoming the Flash, so that he could eventually steal Kevin's Speed Force powers to return to the future.

Future
To be added

Season One
The following appearances in Season 1 include when Thawne disguised himself as Harrison Wells. ◾Pilot