Recently it was revealed that Professor Zoom created a 'Negative Speed Force' that eats away at the regular Speed Force like a cancer and can consume any speedster connected to it by touch. Professor Zoom himself is the engine that generates this Negative Speed Force with every step that he runs. He used it to infect Barry Allen in the hopes that the Negative Speed Force would consume Barry's loved ones and other speedsters who rely on it, consuming Barry in grief so that he'd merge with the Speed Force. Professor Zoom is currently being kept immobile in Iron Heights Penitentiary to prevent him from generating the Negative Speed Force. However, Hunter Zolomon (the most recent Zoom) is kept in the next cell, and believes working together they can be even more powerful, which may be bad news