Martok spent two years in a Dominion internment camp, forced to fight Jem'Hadar soldiers daily in hand-to-hand combat for training purposes. Presumably it was during one of these fights that his left eye was gouged out. During his confinement, Martok came to respect the indomitable character and fighting qualities of Worf. In the episode "By Inferno's Light", Martok escapes and returns to the Alpha Quadrant with Elim Garak, Worf and Julian Bashir, and is made commander of the Klingon forces on "Deep Space Nine".