In the last episode of season 2 titled “The Race of his life”, Zoom invited Flash for a race, the real purpose was to power the magnetar and create a huge trans-dimensional shock which will destroy the entire multiverse. He finally agreed to race him, created a countervailing force to reverse the effects of massive energy generated to activate the cosmic device and finally let time wraiths took him as he distorted the rules of the speed force. But as they carried him through the portal, his body disintegrated and his physical appearance changed dramatically. His face turned eerily black which reminded us of Black racer from the Geoff Johns comics.
Black-Flash is literally the agent of death, as he carries speedsters and returns them to their source i.e speed force. In the comics, Wally west defeated him by racing to the end of time where death is meaningless. He isn’t really a villain, in fact, Barry Allen has taken up the mantle of Black racer in the comics on several occasions. He was speculated to be either Bart Allen’s Reverse Flash (Edward Claris), Reverse Flash of New 52 (Daniel West), New Reverse Flash in DC Rebirth (Godspeed), Reverse Flash of Crime Syndicate (Johnny Quick), Impulse (part of the Thawne family) or the Black Racer (New Gods).
Well, now we know Black racer is Savitar from Geoff Johns original Flash Rebirth who became a thing during Mark Wade’s run. He started off like Max Mercury/Johnny Quick who got stuck in a speed force in the past and then he was brought into the present day. He is a Wally West era villain which explains the presence of Kid Flash.
The executive producer of the show Andre Kriesberg almost confirmed Black Flash’s appearance in the season 3 and he is none other than Zoom/ Hunter Zolomon himself. On his possible appearance, he said “Obviously we did that on purpose. We love working with Teddy [Sears]. He’s such an amazing actor and amazing person and was so much part of the success of the show last season. There aren’t immediate plans for that, but you can’t keep a good Black Flash down, so I am sure we will be seeing him in the future.” CHEERS!