The Cardassian commander of the warship Aldara, who chases the Bajoran terrorist Tahna Los to Deep Space 9 in 2369 and demands that Commander Sisko hand the fugitive over.
Gul Danar is a Cardassian officer who appears in the first-season Deep Space Nine episode Past Prologue. In command of the Aldara, he pursues a small Bajoran craft into Bajoran space and fires on it until its pilot, Tahna Los, is beamed aboard the station.
Danar insists that Tahna is a criminal wanted for attacks on Cardassians and demands his surrender. Sisko refuses to act under threat and, urged by Kira, considers the request for asylum instead, leaving Danar to withdraw under protest.
The Gul and his ship remain close by. When Tahna's real plan, an attack on the wormhole with a bilitrium explosive, is exposed, the Cardassians are again waiting near the border.