The friendly mentor and enthusiastic scientist was just a facade hiding the season’s main villain, Eobard Thawne — a.k.a. Reverse-Flash.

Eobard Thawne - The Reverse-Flash who torments The Flash, committing heinous acts over centuries. Black Manta - Aquaman's archenemy, kidnapper of his child, causing personal vendetta and immense ...

1) Reverse-Flash When it comes to villains, it really doesn’t get much better than the Reverse-Flash. Eobard Thawne goes back in time to kill Barry’s mother but ends up stuck in the past.