Welcome back to Hawkins in the stark winter of 1985, where the original characters must fight new monsters and unravel a paranormal mystery terrorizing their town.

Living together for the first time, half-siblings Jack and Lily are pushed outside their comfort zones as they learn to coexist while navigating new family dynamics, friends, and endless hijinks all while helping run the family's pet grooming and boarding business. With guidance from their parents and grandmother, the two will learn about each other's previously separate lives, blended identity, vibrant culture, and the importance of family.

When a young girl stows away on the ship of a legendary sea monster hunter, they launch an epic journey into uncharted waters — and make history to boot.