[s3e4] Welcome — To The Medusa Center

This episode solidifies Reinaldo as the final antagonist. Unlike the Lazcanos, whose motives were often rooted in greed or reputation, Reinaldo's villainy is fueled by a god complex and a pseudo-scientific obsession with psychiatric experimentation.

In this episode, the investigation into Sara’s fate takes a chilling turn as Álex Guzmán faces immediate physical danger while uncovering the truth about his sister's "death". [S3E4] Welcome to the Medusa Center

Critics noted that this season, and this episode in particular, took the show in an "insane" and "preposterous" direction compared to the first two seasons, leaning heavily into conspiracy theories and mad-scientist tropes. Despite the narrative shift, it remains a fan-favorite for its fast-paced reveals and the introduction of veteran actor Jean Reno. This episode solidifies Reinaldo as the final antagonist

: The episode introduces the Medusa Center, a secretive psychiatric facility led by Reinaldo de la Virgen (Jean Reno). It is revealed that this center is not for healing but for unethical experimentation. Critics noted that this season, and this episode

: Following the events of previous episodes, Álex finds himself fighting for his life in a hospital, while his allies and enemies scramble to protect their own interests.