Obsessed with uncovering the secret of super-speed, a scientist from the 25th century named Professor Eobard Thawne traveled back in time to meet his idol, The Flash. However, when he learned that he was destined to become a villain and die at the hands of the Scarlet Speedster, Thawne went insane and became the Reverse-Flash. The Reverse-Flash harnesses the power of the Negative Speed Force, which grants him many of the same superpowers as The Flash, but also allows him to travel through time. He often uses this ability to travel through time to continuously wreak havoc on the timestream and torment The Flash.