Mugal

"Ha! What do your bullets matter?"

- Mugal to the INTERPOL agents shooting at him

Mugal is the leader of the Black Hole Planet 3 Aliens' invasion force in the film Terror of Mechagodzilla and the eerily identical-looking successor to Kuronuma.

History
Kuronuma arrived on Earth and met with his subordinate Tsuda in Tokyo. Mugal expressed his disgust at the Earthlings' primitive and corrupt society, and his enthusiasm for building a new technological utopia from the ashes of human civilization. Tsuda informed Mugal that he had found a "useful Earthling" who could help them in their mission. Mugal asked why an Earthling would want to help them, and Tsuda replied that this Earthling, Dr. Shinzo Mafune, was once a great scientist whose knowledge advanced too far for his colleagues, prompting them to fire and shun him from the scientific community. Tsuda brought Mafune to the Simians' base in the Japanese wilderness, where he was introduced to Mugal, who revealed who he and his associates were. Mugal told Mafune that if he lent the services of the monster Titanosaurus, whom Mafune controlled, and helped to rebuild Mechagodzilla, then he would provide Mafune and his daughter Katsura with a peaceful prosperous life in their new utopian world.

Mafune assisted the Simians in their plans, but to establish his independence and control he unleashed Titanosaurus without Mugal's approval. Mugal saw this as an opportunity to eliminate threats to his plan: if Godzilla appeared to fight Titanosaurus, he could kill him, eliminating the potential threat of Titanosaurus in the future, while also weakening Godzilla, allowing Mechagodzilla to easily kill him. Godzilla did in fact appear, but only fought Titanosaurus briefly until he retreated. Mugal confronted Mafune and warned him not to disobey him again. Mugal also revealed to Mafune that his daughter Katsura had been augmented with cybernetic modifications, and had the controller for Mechagodzilla implanted inside her. Mafune was distraught, but agreed to help Mugal, as the Simians' cybernetic enhancements had saved Katsura's life twice.