Brelarn

Brelarn was the Warlord of the Zygons. He and a group of Zygons crashlanded on Earth around the start of the 20th century with two Skarasens.

He served as their commander during their plot to defeat the Human-race and turn Earth into a new Zygor. Some of the Zygons felt this was too risky but he felt the risks needed to be taken. (DW: Sting of the Zygons)