Fyrax

 was the commander of the Time Tank which collided with the Doctor's TARDIS. He explained to Romana II that he was on a mission to Aoris' past. He then took the Fourth Doctor to Drang. He was tasked with taking the Doctor to Era 14 as an ambassador. (AUDIO: The Paradox Planet)

He was interrogated as a way to convince the Doctor to help Embery. At the end of the war, he remained in Era 14 and spread the word of Machina with Tyrus. (AUDIO: Legacy of Death)