Lissa Akerman is a character portrayed by Allyssa Maurice in the ABC crime series Castle. Dr. Lissa Akerman is a pharmacist at County Hospital, and one of the many planets in what Ryan dubs the "Galaxy of Greg". The eponymous Greg McClintock is a nurse at County who, by wild coincidence, is considered their "special friend" by practically every woman on staff. This does not, to Castle's disappointment, have the makings of a "Catfight to the Death", as they are all, genuinely, "just friends" - no sex involved.