The War Lord

The War Lord was the leader of the War Lords who made an alliance with the War Chief to kidnap humans to participate in War Games.

After the interference of the Second Doctor, he was tried by the Time Lords and was sentenced to temporal erasure. (TV: The War Games)

The War Lord fathered a son, to whom he was almost identical. His son followed in his footsteps as the joint leader of the Black Coven alongside the War Chief. (PROSE: Timewyrm: Exodus)

In an alternate timeline, the War Lord was able to conquer the entire galaxy with his human army, due to the Doctor being removed from existence. (AUDIO: The Light at the End)