T'Kar was one of two Klingon mercenaries along with Yeto who were employed by Verad during his failed attempt to forcibly join with the Dax symbiont in early 2370. T'Kar was annoyed by the Federation and opposed to their alliance with the Klingon Empire, stating that the Empire was ruled by "doddering fools and frightened old women". He tried to leave Deep Space 9 with Verad, but was overpowered by Odo and Kira Nerys. (DS9: "Invasive Procedures")