Stranger Things- 1-5 1-- Temporada - Episodio 5: ... ^new^

: We see Eleven's memories of being placed in a sensory deprivation tank , where she was used to spy on Russian soldiers but accidentally made contact with the monster.

Inside the tree, Nancy slides down a slimy organic tunnel and emerges in a wet, dark copy of the Byers’ swimming pool. She realizes she has entered the Upside Down . The tree closes behind her. She is trapped. Stranger Things- 1-5 1-- Temporada - Episodio 5 ...

Here's a long-text summary / detailed breakdown of that episode: : We see Eleven's memories of being placed

: A human who can only move forward or backward along a tightrope (our dimension). Stranger Things- 1-5 1-- Temporada - Episodio 5 ...