César Cuauhtémoc González Barrón was a Mexican luchador enmascarado. He was known best as Silver King, but also had an extensive stint as the third wrestler to portray the Black Tiger character. He was the son of luchador Dr. Wagner and the brother of Dr. Wagner Jr. González worked for many years with El Texano as the tag team "Los Cowboys," winning tag team championships in both Mexico and Japan.

Manuel González Rivera was a Mexican professional wrestler, or Luchador best known under the ring name Dr. Wagner. González made his professional wrestling debut in 1961 and worked the majority of his career for the Mexican professional wrestling promotion Empresa Mexicana de Lucha Libre (EMLL). As Dr. Wagner, he worked most of his career as an enmascarado, or masked wrestler, losing his mask to El Solitario in 1985. Along with Ángel Blanco, González formed one of the premier tag teams of the 1960s and 1970s called La Ola Blanca. One of his sons works as a professional wrestler under the name Dr. Wagner Jr., and another son wrestled as Silver King until his death in 2019. One of his grandsons made his wrestling debut in 2009 under the name El Hijo de Dr. Wagner Jr. or Dr. Wagner III.