A new chapter in a seedy ongoing saga will be written July 11 (Tuesday) when Mexican pop star Gloria Trevi's former manager and lover Sergio Andrade appears on "Primer Impacto: Edición Nocturna," airing at 10 p.m. EDT on the Spanish-language U.S. television network, Univisión.

Presumably, he'll tell his side of a story whose scandal-ridden combination of sex, drugs and rock en español has shocked Latin America since the beginning of the year.

The cast of characters consists of Trevi, the singer known as the "Mexican Madonna," who has sold 5 million albums and starred in three films; Andrade; and María Raquenel Portillo, a backing singer who goes by "Mary Boquitas."

The trio have been languishing in a Brasilia, Brazil, jail since Jan. 13, fighting extradition back to Mexico.

Andrade is charged with rape, kidnapping and the corruption of 12 underage girls. Trevi and Boquitas are charged as accessories.

Authorities contend that parents of the girls, some as young as 12, had contracted with Trevi, 29, and Andrade, 39, to develop their children's musical careers, and turned their daughters over to the pair for "safekeeping." However, when the girls became part of the Trevi-Andrade "clan," as the two termed it, they were allegedly taken advantage of.

Paternity Alleged

The case revolves around former "clan" member Karina Yapor. In April 1998, Yapor's parents charged that the baby Yapor abandoned in a Madrid, Spain, hospital had been fathered by Andrade when she was 14. Although Andrade and Yapor denied the paternity, the parents demanded a DNA test. Andrade, Trevi and Boquitas then fled Mexico for South America.

After the trio were captured by Interpol in Rio de Janeiro, Brazil, Yapor, now 18, continued to deny that Andrade was the father of her child. However, she changed her story last month, saying that Trevi and Andrade had instructed her to lie, and that they had mistreated her and forced her to have sexual relations with Andrade.

Yapor has now dwelled at length on her story. A two-part interview with her concluded Saturday on "El Ojo del Huracan," an hour-long newsmagazine on TV Azteca, the Mexican network that first broadcast her parents' charges.

Even the venue for Andrade's appearance today makes a statement. Univisión is associated with Mexico's Televisa, which is engaged in a high-profile battle over the Trevi story with rival TV Azteca. Some observers suspect the two networks have chosen sides on the issue.

"Primer Impacto" dispatched its two anchors, María Celeste Arraras and Myrka Dellanos, to Brasilia, where they conducted a four-hour interview with Andrade. Trevi declined to be interviewed.

"He resists all the accusations his victims have made, everything that has been said against him," Arraras told the Mexico City newspaper Reforma. She added that Andrade, who was hospitalized in late May after reportedly being almost completely paralyzed by stress, appeared "fragile."

Andrade did "on various occasions fix his gaze on the cameras to direct himself to Karina [Yapor]," Arraras said.

Other Accusations Surface

Other attacks on Trevi and Andrade came soon after they fled Mexico. Journalist Rubén Aviña came out with "Aline: La Gloria por el Infierno," a book that detailed Trevi's purported path from glory to "hell" from the point of view of Andrade's former protégé and later ex-wife, Aline Hernández. Since that time, accusations of abuse have come from not only Mexico but also from Spain and Chile.

Born Gloria de Los Angeles Treviño Ruiz in Monterrey, Mexico, Trevi is no stranger to scandal. Nicknamed "La Atrevida" (The Bold One), Trevi first tasted success in Mexico in 1989 with her single "Dr. Psiquiatra" (RealAudio excerpt).

She went on to establish a rebellious, sexy, wild-haired image with such Andrade-produced songs as "Pelo Suelto" (Loose Hair) (RealAudio excerpt) and albums as Mas Turbada Que Nunca (More Disturbed Than Ever), released in the United States in 1994, and No Soy Monedita de Oro (I'm Not Made Out of Gold), a remix-dominated collection released last fall.

Trevi's catchy music and larger-than-life image appealed especially to children, although her series of mostly clothes-free calendars, beginning in 1992, attracted an older audience.

According to a report earlier this year in the Buenos Aires newspaper Clarin, Trevi once was the girlfriend of Amado Carrillo Fuentes, head of the "Cartel de Juárez," who had supposedly laundered millions of dollars in drug profits by buying real estate in her name.

For his part, Andrade was a powerful force in the Mexican music industry, and well connected politically; his brother, Eduardo Andrade, was a senator influential in the PRI, the party that ruled Mexico until last week's elections.

"The hell is just beginning," Clarin quoted Luis Treviño, Trevi's brother, as saying. "Gloria knows many things about very important people and she can talk."