He was introduced to Lucha Underground at the end of season two and has worked for various Japanese promotions, most notably for New Japan Pro-Wrestling (NJPW).

González worked under a mask from his debut in 1985 until August 2017, when he was forced to unmask after losing to Psycho Clown in a Lucha de Apuestas at Triplemanía XXV.

[8] In the early 2000s César González introduced the wrestling world to a son, referred to only as "El Hijo de Silver King", who at the time was training to be a wrestler.

The anonymity of the El Invasor character allowed González to gain in-ring experience without the pressure of the Dr. Wagner name.

On April 2, 1993 the collaboration between the two companies led to Dr. Wagner Jr. defeating Pierroth Jr. to win the CMLL World Light Heavyweight Championship.

[16] In November of that year El Canek stopped working for CMLL, forcing Dr. Wagner Jr. to give up his half of the world tag team championship.

This led to the crowd being solidly behind the until-then hated Dr. Wagner Jr. as he put his mask on the line against El Canek, Universo 2000 and Rayo de Jalisco Jr.

[20] As result of the newfound popularity of Dr. Wagner Jr. CMLL decided to turn El Canek rudo (villain), allowing for the rivalry to continue.

The rivalry continued for several months until Dr. Wagner Jr.'s focus shifted to newcomer L.A. Park, resulting in a series of very violent, out of control matches between the two.

[14] In 1997 he participated in Best of the Super Juniors IV, where he defeated Doc Dean and Chavo Guerrero Jr. but lost the remaining four matches and failed to advance.

[29] The reign with the IWGP Junior Heavyweight Tag Team Championship ended after 96 days, with two successful defenses, before losing the belts to The Great Sasuke and Jyushin Thunder Liger on April 10, 1999.

First he chased off La Legión Extranjera before turning around to challenge the AAA Mega Champion El Mesias to a title match.

[33] After his title win Wagner went on to form the stable Los Wagnermaniacos with Silver King, Electroshock and Último Gladiador.

Dr. Wagner Jr. successfully defended the Mega championship against both El Mesias and Cibernético in a Steel Cage Match at the 2009 Verano de Escandalo ("Summer of Scandal") show.

[40] On August 15, 2010, at Verano de Escandalo Dr. Wagner Jr. successfully defended the AAA Mega Championship in a three-way match against Silver King and Vampiro.

[44] On June 18, 2011, at Triplemanía XIX, Wagner Jr. defeated Total Nonstop Action Wrestling (TNA) performer Rob Van Dam to become the first ever AAA Latin American Champion.

[47] On October 9 at Héroes Inmortales, Dr. Wagner Jr. made his first successful defense of the AAA Latin American Championship by defeating El Hijo del Perro Aguayo in a Bullterrier match.

After the match, two of AAA's top técnicos, and Wagner's allies, La Parka and Octagón, both turned on him and joined Aguayo's Los Perros del Mal.

For the past weeks, Wagner had teased "invading" CMLL and settling his score with the likes of Atlantis and Último Guerrero.

[62] It was later reported that Wagner decided to not work the anniversary show out of loyalty to L.A. Park, who had been released by the promotion days earlier.

[63] A year after leaving AAA, Wagner returned to take part in Triplemanía XXII, putting any past issues behind them.

[65] Dr. Wagner Jr. did not appear for AAA for the rest of the year, not returning until the 2016 Lucha Libre World Cup tournament in June 2016.

[70] On August 26, 2017, Wagner was defeated by Psycho Clown in a Lucha de Apuestas at Triplemanía XXV and was forced to unmask as a result.

[72] On October 4, at Héroes Inmortales XI, Wagner was defeated in a title fight by the AAA Mega Championship against Johnny Mundo.

On June 4 at Verano de Escándalo, Wagner was defeated along with Rey Mysterio Jr., thus losing his title to Jeff Jarrett who made his return to the company with the help of Konnan.

[78] In June 2010, Dr. Wagner Jr. won a four-way match to become the wrestler to be featured on the cover of the video game Lucha Libre AAA: Héroes del Ring, which was released on August 9, 2010, in North America.