The Flash Season 2: 28 Easter Eggs & References You Might've Missed
3. Black Flash
At times Zoom seemed like a great villain, especially in early Season 2 episode Enter Zoom. However, he never quite reached those same heights again, mostly due to the fact that his motivations were never quite clear or all that believable, he was outweighed by all the mysteries surrounding him, and he'd often disappear for entire stretches.
Still, he was defeated as all villains must be, but in that defeat the door was left open for his return. As the Time Wraiths come to drag him away, streaks of red appear on his costume around the logo and ears, and combined with the image of his torn face it all amounts to him becoming the Black Flash.
Basically, Black Flash serves as the Grim Reaper for speedsters, so if he does reappear, it's not going to be good news.