Mercury Labs is a research company located in Central City.
A doctor is greeted by a security guard named Jimmy. Jimmy intriguingly asked what he was working on but the doctor only gave an answer of mystification by saying "the future." An alarm buzzed in the facility, and the patrolling guards have the doctor get to safety. The Reverse-Flash killed both of the guards instantaneously. He appeared in front of the door, staring menacingly at the doctor.
After losing her husband, Ronnie Raymond, Caitlin Snow chose to work at Mercury Labs because staying at S.T.A.R. Labs reminded her too much of her loss. Cisco Ramon visited her for some help in regards to "Atom-Smasher"; later Barry Allen also paid a visit. They watched a video Eobard Thawne left for Barry, and witnessed his confession of murdering Nora Allen. Some weeks later, Harrison Wells from an alternate Earth broke in and stole an energy-firing gun, with Dr. McGee catching his face. Mercury Labs was later destroyed by Laurel Lance (Earth Two) during the Metapocalypse when Zoom brought his loyal followers to Earth One.
- Bill Carlisle (deceased)
- Eliza Harmon (deceased)
- Lindsay Kang (deceased)
- Brie Larvan
- Caitlin Snow
- Unnamed (physict)