Stranger Things 2x7 Chapter Seven: The Lost Sister Season 2 Season 1 8 EpisodesSeason 2 9 EpisodesSeason 3 8 EpisodesSeason 4 1 Episodes 2x1 - Chapter One: MADMAX 2x2 - Chapter Two: Trick or Treat, Freak 2x3 - Chapter Three: The Pollywog 2x4 - Chapter Four: Will the Wise 2x5 - Chapter Five: Dig Dug 2x6 - Chapter Six: The Spy 2x7 - Chapter Seven: The Lost Sister 2x8 - Chapter Eight: The Mind Flayer 2x9 - Chapter Nine: The Gate Psychic visions draw Eleven to a band of violent outcasts and an angry girl with a shadowy past.