These events happened after Crisis on Infinite Earths. Because continuity was rebooted, the Prof.'s origin was changed and his death never happened. Eobard was a massive fan of the Flash to the point of replicating his powers and surgically altered himself to look like his hero. As such, he used the time machine Cosmic Treadmill to meet Barry. However, he discovered he was destined to become a super villain and went insane (a flaw with the time machine helped). He became convinced he was Barry Allen. However, the Wally West Flash (Barry died) figured out he wasn't due to his overly violent nature and sent him back to his own time. Despite losing his memories of his trip, Zoom had a subconscious and bitter hatred of Barry. As such, he went back in time to get revenge. Professor Zoom travelled back in time to stop Barry becoming the Flash, but didn't when he realize this would erase himself from the timeline. However, he killed Allen's mother and was responsible for the events of Flashpoint, but Flash stopped him.
ZoomHunter Zolomon was a police officer that worked with the Wally West Flash. Zolomon was crippled by Gorilla Grodd. He asked Flash to use the Cosmic Treadmill to go back in time and stop Grodd. Fearing damaging the timeline, Wally refused. Zolomon tried to use the machine himself, but altered his connection to timeline instead thus giving him the ability to alter his own time frame, which allowed him him to mimic super-speed. Zolomon became the new Zoom to create tragedy in Wally's life to make him a better hero. Despite the Flash using the Spectre to erase the world's memory of his identity, Zoom was unaffected and still menaced Wally. He helped various Justice League villains (since the Flash was a JL member). Zoom and Professor Zoom wore identical costumes.
Inertia / Kid Zoom
UnknownIn the New 52 reboot, a version of the Reverse-Flash will appear. This version will be darker in color and not be yellow.