Eobard Thawne, also known as Reverse-Flash, is a major antagonist in The Flash series. A brilliant scientist from the future, Thawne becomes the arch-nemesis of Barry Allen, the Flash. Fueled by a deep obsession with the Flash, Thawne replicates the accident that gave Barry his powers, becoming the Reverse-Flash. His primary motivation is to destroy everything Barry Allen holds dear. Thawne's intellect and speed make him a formidable foe, and his actions significantly impact the timeline, often causing chaos in Barry's life and the broader universe.