The fourth season of the Argentine series El Marginal sends familiar rivals to Puente Viejo after the fire at San Onofre. Netflix’s season announcement names Pastor, Diosito and Mario Borges among the returning prisoners. A transfer may look like a reset of the board, but these men do not arrive without shared history. Pastor and Diosito’s reunion is especially charged because the announcement says it revives strong feelings on both sides. The new prison supplies a place where past alliances and antagonisms must be negotiated under a different local order.
That order has an identified rival. César, transferred to Puente Viejo, leads the Sub21 group. He is not simply another obstacle placed in Pastor’s path; he has followers whose position inside the prison could shift with each confrontation. Outside, Sergio Antín attempts to take power over the facility by opposing its current director. The official trailer announcement lays out these simultaneous lines of pressure. One contest is among prisoners; another runs through administrators and an operator beyond the walls. They can affect each other without being the same fight.
Emma Molinari gives Pastor a different kind of connection to the outside. The production synopsis says she helps him prepare another dangerous escape attempt. That fact turns the season’s power map into a practical dilemma. An escape requires timing, access and trust, all of which can be disrupted by César’s group, Diosito’s unsettled relation with Pastor or Antín’s maneuvering. The story does not need every character to stand for an abstract category of authority. Each has a specific objective that can collide with Pastor’s attempt to leave.
Sebastián Ortega created the Argentine prison drama. Netflix’s production note credits Ortega and Israel Caetano with the original story, and Alejandro Ciancio and Mariano Ardanáz as directors of this season. Those credits mark a long-form serial that can move characters through institutions while preserving consequences from earlier seasons. The San Onofre fire is an event in the plot, not an eraser. Puente Viejo gives the writers a way to compare how different forms of control operate when the same people are placed under new conditions.
The central pressure is thus easy to state without turning it into a generic thesis about prisons: Pastor needs to get out, Emma is helping, and several actors have reasons to block, use or redirect him. The facility’s walls matter because they force those interests into close quarters, while Antín’s role shows that confinement does not seal off the struggle. The drama lies in what each named person can do to the escape before Pastor reaches a gate.