Chapter Seven: The Lost Sisterstranger Things :... Today

Psychic visions lead Eleven (Jane) to Chicago, where she finds Kali (Subject 008), a fellow test subject from Hawkins Lab who possesses the power of illusion. Kali leads a gang of outcasts on a vigilante mission to execute those who harmed them at the lab. While Eleven initially joins them—receiving a punk-style "bitchin'" makeover—she ultimately refuses to kill a former lab worker, Ray Carroll, after discovering he has children. Through a vision, Eleven realizes her friends in Hawkins are in grave danger and decides to return home, choosing her "found family" over revenge. Detailed Guide to Kali's Role in Stranger Things

In Stranger Things Season 2, " Chapter Seven: The Lost Sister " stands as the series' most polarizing episode, serving as a standalone detour from Hawkins into the gritty, urban streets of Chicago.