Danar was a Cardassian military officer serving during the late-24th century.
By the year 2369, he had achieved the rank of Gul and served as commander of the Galor-class warship Aldara.
Later that year, Danar was ordered to apprehend the Bajoran Kohn-Ma terrorist Tahna Los, who he pursued to Deep Space 9. Danar demanded that Commander Sisko hand over Tahna to him, but Sisko denied his request to consider Tahna’s application for asylum.
In order to speak with Tahna in private, Sisko ordered Operations Chief Miles O’Brien to put Danar and his ship through lengthy “docking regulations”, much to Danar’s frustration.
After Sisko had granted Tahna’s request for asylum, an angry Danar left Deep Space 9 for Cardassian space, however, he was later contacted by Sisko for help in apprehending the USS Yangtzee Kiang, which Tahna had hijacked and equipped with a bilitrium-based explosive device hoping it would destroy the Bajoran wormhole. Danar orders his ship to intercept the runabout but not before trying to tell Sisko he was right about Tahna. (DS9: “Past Prologue”)