Dr. Clariss is a professor who believes he has recreated Velocity-9, the chemical that enhances Jay Garrick’s super speed. Jay Garrick was the Earth-2 Flash and he turned out to be Zoom too, the big bad of Season 2 of “The Flash.”
When no one believed in his discovery, Dr. Clariss takes to the streets as the darker version of The Flash to prove it.
The character was actually given a glimpse of during the San Diego ComicCon in July and The Rival actually looked a bit like the New 52 version of the Black Racer.
The first teaser for “The Flash” Season 3 also showed Barry Allen, trying to wrap his brain around Flashpoint and he seems to be drawing help from the new universe’s Henry Allen, his father.
There have been reports that the Flashpoint storyline for Season 3 of “The Flash” shall feature one particular element.
Accordingly, Barry Allen shall be getting new memories in the Flashpoint storyline to match his altered universe.
He shall have new memories of graduating high school and college, which are memories he never had in the original storyline. However, those new memories will be replacing other things from the other timeline.