Warning: Spoilers ahead for tonight's episode of The Flash, titled "The Race of His Life."
Tonight's episode of The Flash packed quite a few wallops, but those last five or ten minutes just dialed it up to eleven.
After he was finally beaten, Hunter Zolomon (Zoom) wasn't killed by Barry, as so many fans had speculated would happen, potentially setting up the classic "Trial of The Flash" storyline from the pre-Crisis on Infinite Earths era.
Instead, another classic Flash story was set up, while Zolomon...well, he spent so much time trying to bend the rules of the Speed Force that when the Time Wraiths finally caught up with him, they forced him into service of the Speed Force...as what appears to be the Black Flash.
In the comics the Black Flash is a grim reaper for speedsters, taking the spirits of the departed. A force of nature, The Black Flash was originally created during Grant Morrison's short run on the series but played a bigger role during Geoff Johns's time writing The Flash.
At one point, Barry Allen even became the Black Flash himself for a brief moment -- but probably the most significant thing here is that Professor Zoom actually became the Black Flash after his reanimated corpse was used by Nekron in Blackest Night.
The dessicated appearance, bad teeth, and the change in color on his uniform's logo (suddenly it had a white background and red lightning bolt) and earpieces (ditto the red), indicate that Zoom wasn't merely forced into service as a Time Wraith, but is actually the Black Flash.
You can check out some photos below, along with a few comics images of the character.