Before becoming a professional wrestler he practiced amateur wrestling. He won a National Sub-Championship in olympic wrestling in 1964.
He made his wrestling debut as Angel Blanco in November 1969 against Black Terror. However, he was inactive as a wrestler for a while and during that time, a new Angel Blanco appeared on the scene to great popularity. The new Angel Blanco was El Ranchero Vargas, who he had wrestled before. The promoters of Arena Coliseo asked him to change his name to avoid confusion.
He had a fierce rivalry with Mano Negra, which resulted in a hair vs mask match, which Demonio lost. According to an interview with Demonio, he had created a new Mongolian look for people to see when he unmasked. The idea backfired though as he looked so different than what was expected that the fans thought it wasn't the real Demonio Blanco, leading to backstage heat.
After the loss, he had tours in California, Texas and Japan. In 1978, he saw the movie, "Star Wars" and came up with a C3P0 gimmick named. Robot C3. He proposed that Mario Alcala become his partner as Robot R2, but Alcala had alcohol issues. They wrestled with the gimmick in countries like Japan and America (with 20th Century Fox even threatening him with a lawsuit for it). The gimmicks ended up going to Barba Negra and El Rebelde. Demonio then decided to retire due to right knee and vocal chord injuries.
He founded his own gymnasium Gimnasio Demonio Blanco and Arena Demonio Blanco in Puerto Vallarta. He then came back from retirement under the name of Fantomas. That gimmick was heavily based on the comic book character with the difference that the character was a magician. And true to the name, he often performed magic tricks in the ring. He continued his wrestling career until 1992 when he retired for good.
