Ardus was one a high-ranking member of the Terran Federation, an officer of the Bureau. He was blinded by radiation at some point during his service, and wore a sonoscope to replace his sight. He was the last surviving officer with knowledge of the XX security clearance codes for Bucol-2.
When Commissioner Sleer threatened his family, Ardus reluctantly divulged the information about Bucol-2 to her. He also, however, revealed that he recognized her as Servalan. When he left Sleer's cruiser, she made sure that no flight plan had been filed and then arranged for his ship to be destroyed.
Ardus is derived from Blake's 7.