The Marginal

 (Spanish: El Marginal) is an Argentine police prodecural thriller TV series created by Sebastián Ortega and Adrián Caetano starring Juan Minujín, Nicolás Furtado, Claudio Rissi, Martina Gusmán and Gerardo Romano. The series aired on June 2, 2016, in Televisión Pública Argentina, and the first three seasons aired from that network, before being internationally distributed by Netflix on January 19, 2022, with a fourth season being exclusively available on the streaming service.

Summary
"While investigating a kidnapping, an ex-cop sent to infiltrate a prison finds himself surrounded by dangerous felons who can't know his real identity."

- Official Netflix synopsis