Premise: Agustin "Gus" Guerrero, also known as El Gato Negro, is a fictional character and comic book superhero created by Richard Dominguez and published by Azteca Productions. The character made his first appearance in "El Gato Negro" #1 (October 1993) as a major supporting character. Outside of the comic book continuity he is often referred to as "Silver Age El Gato Negro".
Hypothesis: El Gato Negro is known by many different nicknames.