Suns of Mandalore
As a Karkarodon, he is quite an uncommon sight within the human-centric Imperial military.
But as the Mon Cala poured more and more support into the Rebellion, the Empire needed help conquering their watery world. Thurgen proved himself as effective as he is brutal in the invasion of Mon Cala, and ruled with an iron fin during the prolonged occupation of the world.
The occupation ended after the launch of the Mon Calamari city-ships into space, and the newly promoted Admiral Thurgen went on the offensive, pursuing them across the galaxy.