Arvin Erhardt was a Manticoran citizen from the planet Sphinx. His family was among the original colonists who came to the Manticore System aboard the Jason. (SK1) He was an employee of BioNeering who was adopted by a treecat named True Stalker. He was killed when his aircar crashed after it was sabotaged by Dr. Muriel Ubel. (HHA2.1: TS)