: A patient named Oliver, controlled by the Nogitsune, threatens Malia's life, forcing Stiles to surrender and let the dark spirit back into his body to save her.

: Scott, Allison, and Kira execute a plan to rob an armored car to retrieve a Shugendō scroll that contains instructions for exorcising the Nogitsune.

"Echo House," the 20th episode of Teen Wolf Season 3, is a critical turning point where Stiles Stilinski checks himself into a psychiatric hospital to protect his friends from the Nogitsune. Plot Overview

: Deaton translates the scroll, suggesting that changing the host's body—potentially by turning Stiles into a werewolf —is the only way to expel the spirit. Key Characters Teen Wolf recap – Season 3, Episode 20: Echo House