Doctor Nel Apgar was a male Tanugan scientist in the 24th century. He was married to Manua Apgar. In 2366, he developed a Krieger wave converter on the Tanuga IV research station. Supported by the United Federation of Planets, the method could prove to be a new power source. However, motivated to reward his wife for all the patience she had shown with him during his devotion to his work, he decided to sell the Krieger wave converter as a weapon to other organizations for a more profitable outcome. He therefore started ordering more dicosilium over several months in order to create larger reflective coils.