Marber

 was the first officer to Mirana. He was worried when he couldn't find out what a destroyed cargo freighter carried. (AUDIO: Dalek War: Chapter One)

He tried to kill Susan Mendes after he found out the Dalek Emperor was in her mind, and wanted to follow the Mentor's orders. (AUDIO: Dalek War: Chapter Two)

He was presumed to have escaped with Mirana when Daleks attacked their ship. (AUDIO: Dalek War: Chapter Three)