Damar was a recurring character in the science fiction television series Star Trek: Deep Space Nine, played by Casey Biggs. He appeared in 23 episodes, and rose to a prominent role in the seventh and final season.
Dukat's capture by Starfleet results in Damar being promoted to legate, and becoming the head of the Cardassian government, succeeding Gul Dukat. In this capacity, he works closely with the Vorta Weyoun to coordinate the Cardassian military's involvement in the Dominion's war against the Federation and its allies. Cardassia's huge losses during the war, about which Weyoun and the Dominion's Founders seem indifferent, lead Damar to drown his sorrows in kanar (Cardassian liquor). Damar resents not being informed about the Dominion's negotiations to bring the Breen into the Dominion, and in general comes to realize that he is Cardassia's leader in title only.
Recognizing the critical role Damar and his followers could play, Starfleet commissions former resistance fighter Kira Nerys as a Starfleet commander and dispatches her and Elim Garak to help Damar's group. With their help, Damar's group is able to continue to inflict damage on the Dominion, and Damar himself takes part in a mission to capture a Jem'Hadar ship equipped with a Breen energy-draining weapon.
Gul Revok's betrayal of the resistance helps lead to its virtual annihilation. While hidden on Cardassia Prime, Damar learns the Dominion has destroyed all of their bases. Learning, however, that the Cardassian people don't (and don't want to) believe that he and the resistance have been destroyed, Damar, Garak, and Kira carry out attacks on Dominion resources on Cardassia Prime, and Damar implores Cardassians to resist their occupiers.
During the Battle of Cardassia, Damar leads a small band in attacking the Dominion's headquarters on Cardassia Prime. Although he is killed shortly after getting inside the facility he leaves his famous last word, "keep...". The assault is a success, leading to the Female Changeling's capture and facilitating the Dominion's surrender.