Produced by Globomedia and broadcast by Fox Spain.

[1] Season four deals with the aftermath of Zulema (Najwa Nimri), Saray (Alba Flores) and Altagracia's (Adriana Paz) escape.

Dr. Sandoval (Ramiro Blas) is the new Director of Cruz del Norte, who enforced violence to tame the inmates making the prison dangerous more than ever.

Soledad Nunez (María Isabel Díaz Lago) is revealed to have Alzheimer's disease.

Macarena (Maggie Civantos) goes out finally up from her coma.