at 6 years old when he was in the crowd along with his mother Angie and his younger sister Aalyah watching his father Rey Mysterio win the WWE Cruiserweight Championship from Matt Hardy.

After the match, Dominik came over the barricade and into the ring to celebrate with his father, who promptly gave him a massive hug and hoisted him up on his shoulders.

in the crowd again with Angie and Aalyah watching his father compete against WWE Champion Brock Lesnar in a non-title match in a losing effort.

In the summer of 2005, Dominik made his third appearance in WWE at the age of 8, but this time in a more prominent role, as part of his father Rey's ongoing feud with Eddie Guerrero, in which the two rivals fought for custody of him.

[2] He made two more appearances in 2006, first at WrestleMania 22 with Angie and Aalyah watching his father win the World Heavyweight Championship for the first time and second on the September 15 edition of SmackDown!

He once again appeared on the March 12, 2010 episode of SmackDown, this time during the feud between Rey Mysterio and the Straight Edge Society (CM Punk, Luke Gallows, and Serena).

[3][4] On the March 19, 2019 episode of SmackDown Live, Dominik appeared with his father, Rey Mysterio, who announced that he would be facing Samoa Joe for the WWE United States Championship at WrestleMania 35.

[15] After the event, Dominik and Rey began to work as a tag team, defeating Rollins and Buddy Murphy at Payback.

[22] Later backstage, Miz accused Rey of cheating due to Dominik and said he would find a tag team partner who was a "global superstar".

During Rey's 20th anniversary celebration on the July 25 episode of Raw, the Mysterios defeated Bálor and Priest in a tag team match.

[28] Following his heel turn at Clash at the Castle, Dominik officially joined The Judgment Day on the September 5 episode of Raw and helped the group attack Edge and Rey.

[34] On the March 31 episode of SmackDown, Rey reformed the Latino World Order and invited Legado Del Fantasma (Santos Escobar, Zelina Vega, Joaquin Wilde, and Cruz Del Toro) to join as a token of appreciation for aiding him in his feud against Dominik and The Judgement Day.

On the March 22, 2024 episode of SmackDown, Escobar, who defected from the LWO in November 2023, defeated Rey after interference from Dominik.

[41] After being released from police custody, Dominik took on an additional gimmick of being a former convict-thug who "had served time in prison with the world's most dangerous people" but in reality, he was only in county jail for a few hours.

At the end of the dinner, Dominik fled the restaurant after seeing two police officers entering the premise thinking there was a sting operation on him as "[he was] the most wanted man on TikTok".