15 Best Teen Wolf Episodes
7. Echo House (Season 3, Episode 20)
After becoming concerned with his and his friend's safety thanks to the threat of the Nogistune, Stiles decides to hide out in Eichen House. There, he meets Malia, befriends his bunkmate Oliver, and slowly begins to succumb to the Nogistune's influence.
Echo House works as a stand-alone mystery in a lot ways, as Stiles races to figure out why he recognises the basement of the institution and how he can save himself from the spirit threatening to destroy to life. It also works as a top-tier slice of horror, and builds on the legend of the Nogistune brilliantly.
The episode also has a side-plot in which Derek and Argent begin to bond, and question what will happen if they can't save Stiles. It makes for some great character development, whilst Stiles's arc doubles down on the threat the Nogistune poses - with tragic results.