In the mirror universe, T'Kar was a Klingon male official of the Obsidian Order, the intelligence-gathering organization of the Klingon-Cardassian Alliance, during the late 24th century. He was eccentric and had little proficiency with machines. He kept a Vulcan slave named Tuvok in his household for several years. Tuvok eventually took advantage of T'Kar's mechanical ineptitude, using technology to assist in his escape at some point prior to 2371. (VOY - Mirror Universe novel: The Mirror-Scaled Serpent)
- The fact that Tuvok was his slave is an in-joke based on the fact that both characters were played by Tim Russ.