Mercy Lab is a location featured in Z Nation Episode 1 season 3 "No Mercy"
Mercy Labs is where a scientist named Dr. Teller was working with his wife Sarah in studying mycology.
As the ZN1 virus hit, they shifted focus and tried to come up with a cure based on fungi. The lab was eventually overrun by zombies and there was an explosion, resulting in that the lab was contaminated. Sarah Teller among with other scientists was infected and locked in the lab. Now they exist as living dead. They are not zombies but no longer human. They can communicate via Murphy.