The mirror-universe counterpart of Doctor Phlox, a callous Denobulan physician on the ISS Enterprise who helped design the agony booth and enjoys experimenting on living creatures.
The mirror Phlox appears in both parts of In a Mirror Darkly. Where his counterpart keeps a menagerie to heal the crew, this Phlox dissects his animals for amusement, and his medical knowledge of dozens of species was put to use in building the agony booth with Major Reed.
After Enterprise is destroyed he serves on the USS Defiant, where he reads the historical database and dismisses the other universe's literature as weak, Shakespeare aside.
T'Pol persuades him to join the conspiracy against Archer, and he begins disabling the Defiant's systems from a crawlway so that the Avenger can attack. Archer catches him in the act and beats him, restoring power in time to win the battle.