- For other uses, see Denak.
In the early part of that century, he was an agent of the V'Shar, and in the year 2135 led a mission to the outpost world of Trilan which included new agent T'Pol. There, they encountered a race called the Fri'slen, who killed three of the six members of Denak's team. He was able to escape with T'Pol and fellow agent Ych'a, and later called in a military airstrike on the caverns where the Fri'slen lived. This was one of several times when T'Pol saved his life.
Denak remained in, or connected with, the V'Shar into 2155. In that year, he informed T'Pol that Vulcan Captain Sopek, thought dead, was alive and operating covertly within Romulan space for the Vulcan Security Directorate. He also helped T'Pol secure passage to Taugus III, a planet in Romulan space, where they believed Commander Trip Tucker could be found. (ENT novel: Kobayashi Maru)
Later married to Ych'a, whom he subsequently thought dead in 2155. Ych'a was later revealed working deep in Romulan space on a clandestine mission for the V'Shar together with Tucker. Denak asked for help from his old friend and co-worker T'Pol to track her down and bring her home, because he was the only one still believing her to be alive. (ENT - The Romulan War novel: Beneath the Raptor's Wing)
Denak and Ych'a were not released until 2158, after Silok was forced to resign from the V'Shar because of a scandal. Vulcan Administrator T'Pau released the two personally. (ENT - The Romulan War novel: To Brave the Storm)