Professor Zeta was a mentor and teacher for Pepi, especially taught her martial arts, Zen discipline and how to resist 101 courses at his friend Hattori Panzo's Sushi restaurant, during the legendary "Zen & Sushi Week". The Professor wears only yellow, has rather naive methods of investigation and is always accompanied by a model of a car from the movie "Cars 2", a film he is passionate about. Indeed the car is also his "Cylon Revelator" and gives name to its character: Professor Z. Zeta has extremely formal and sometimes anachronistic ways. He argues, confronts and ironizes with Agent Ypsilon, but they still makes together an unbeatable team. He is very attracted by the mysterious girl (who offers a cigarette kept in the same pocket for about 10 years) and by the wonders of the Universe of Sound.