Dionicio Castellanos Torres (born May 19, 1971) is a Mexican professional wrestler, better known by the ring names Psicosis (sometimes Anglicised as Psychosis) and Nicho el Millonario.

In March 1989, Castellanos began wrestling as "Psicosis" for the local promotion in his native Baja California, where some of his biggest feuds pitted him against El Hijo del Santo and Rey Mysterio Jr.

Psicosis first made a name for himself in the United States through AAA's 1994 pay-per-view broadcast When Worlds Collide, where he, Fuerza Guerrera, and Madonna's Boyfriend defeated Heavy Metal, Latin Lover, and Rey Mysterio Jr. Psicosis debuted in the United States-promotion Extreme Championship Wrestling in September 1995, facing Mysterio Jr. in a critically acclaimed bout at Gangstas Paradise.

Psicosis was recruited by ECW booker Paul Heyman – who was seeking new talent to replace Chris Benoit, Eddie Guerrero and Dean Malenko, all of whom had recently left the promotion – at the recommendation of Konnan.

After Onoo dropped them in favor of Yuji Nagata, the team began to break up, with La Parka attacking Psychosis after the matches.

[4] In 1998, Psychosis joined Eddie Guerrero's Latino World Order (LWO) group, which consisted entirely of Mexican wrestlers.

During the April 19 episode of Nitro, Psychosis defeated Blitzkrieg, Juventud Guerrera, and Rey Mysterio in a four-way bout to win the WCW World Cruiserweight Championship for the first time.

In reality, Guerrera and Jerry Flynn were arrested on DUI charges; Psychosis immediately lost the belt to previous champion Jushin Thunder Liger.

[1] He had a lengthy run in Xtreme Pro Wrestling, aligning himself with Konnan, Juventud Guerrera, Halloween, and Damien as "La Familia."

In the following weeks, they would continue to make run-ins in matches and mock the stereotypical image of Mexicans in the United States, even coming to the ring each with their own riding lawn mower.

[8] On July 24 at The Great American Bash in Buffalo, New York, they defeated Blue World Order in a six-man tag match when Psicosis pinned Steven Richards to secure the Mexicools' first pay-per-view win.

At the end of 2006, he accidentally shattered his nose in a match against El Hijo de Rey Misterio, and also got his head shaved.

Psicosis then joined Halloween's new version of La Familia de Tijuana, along with Extreme Tiger, in AAA under the ring name Nicho el Millonario.

He returned after an absence from the company and joined Joe Líder's new rudo stable, while helping attack La Familia de Tijuana and the Mexican Powers.

On September 14, 2008, at Verano de Escandalo, Nicho and Joe Líder, known collectively as "La Hermandad Extrema" (the Extreme Brotherhood), won the AAA World Tag Team Championship by defeating Crazy Boy and Último Gladiador and The Hart Foundation 2.0 (Jack Evans and Teddy Hart) and champions Halloween and Extreme Tiger in a four-way ladder match.

[18] On June 6, 2010, at Triplemanía XVIII, La Hermandad 187 participated in a four-way elimination match for the AAA World Tag Team Championship.

Later, Líder was pinned by James Storm of Beer Money, Inc. after interference from Konnan, denying them the chance to regain the tag team championship.

La Hermandad received their rematch for the AAA World Tag Team Championship from Los Maniacos (Silver King and Último Gladiador) on September 19, 2010, but Líder was forced to enter the match without Nicho, who was taken out by El Zorro, Hernandez and La Legión the previous week, and was unable to regain the championship.

[21][22] At Héroes Inmortales IV Nicho and Líder gained a measure of revenge on Konnan by defeating him and Perros del Mal members Damián 666 and Halloween in a three–on–two handicap hardcore match.

[24] On December 5 at Guerra de Titanes Nicho and Líder received a shot at the AAA World Tag Team Championship, but were unable to dethrone Los Maniacos in a three-way ladder match, which also included Hernandez and El Ilegal.

[34][35] In storyline, Líder's fireball had not only severely burned Nicho's face, but the incident had also driven him insane, causing him to once again don a mask and refer to himself as Psicosis.

[36][37] On August 5 at Triplemanía XX, Psicosis reunited with Líder for one night to take part in a Parejas Suicidas steel cage match, featuring three other former tag teams.

[42] On August 15, 2014, La Familia de Tijuana (Damian 666, Extreme Tiger, Halloween and Nicho) against and lost to Chavo Guerrero Jr., Hernandez, Homicide and Luke Hawx in an 8-man tag team match at Zeus Promotions Debut Show.

Four weeks later on September 26, 2014, Psicosis and Venom defeated Freesbe and La Abeja in a tag team match at BSW.

The family divide their time between their homes in Tijuana, Baja California, Mexico, Manhattan, and Los Angeles in the United States.

Castellanos was arrested on October 9, 2006, the night after he allegedly stole a car from a 23-year-old Alexander Valencia Ramirez of Rosarito Beach, Baja California.