Sergeant Cathka is a male batarian who is employed by the Blue Suns as a mechanic on Omega. He is in charge of repairs to his leader's gunship. During the mission to recruit Archangel, Commander Shepard will meet the Sergeant at the third barricade. The Commander can ask him questions about the mission. Shepard can incapacitate him when he returns to repairing the gunship, thus preventing Cathka from completing repairs.