Salonu Prime

 was the leader of the Salonu. He was enslaved to the Master's TARDIS and informed of the Fourth Doctor's habits. It wanted to destroy the humans' economy. (AUDIO: The Evil One)

They came to Earth in 6th century BC to refuel, where their ship was shot down by Cuthbert. (AUDIO: The Pursuit of History) They wouldn't listen to K9 Mark II's warning to stop the nitrogen conversion. (AUDIO: Casualties of Time)