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Season guide

The 100: Season 5

13 episodes Premiered Apr 24, 2018 Updated Sep 22, 2026

The 100 Season 5 continues the overarching saga across 13 episodes. The series follows the descendants of post-apocalyptic survivors from a space habitat, the Ark, who return to Earth nearly a century after a nuclear apocalypse. Set 97 years after a catastrophic global event, the American post-apocalyptic sci-fi television series was created by Jason Rothenberg and is loosely based on the book series of the same name

Previously on The 100

Season 5 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • The series is set 97 years after a nuclear apocalypse devastated Earth.
  • The human characters are descendants of survivors who originally lived in a space habitat known as the Ark.
  • The survivors return to Earth to determine if the planet is habitable.
  • Survival is the core conflict and central theme for the characters.

Season overview

The 100 Season 5 continues the overarching saga across 13 episodes. The series follows the descendants of post-apocalyptic survivors from a space habitat, the Ark, who return to Earth nearly a century after a nuclear apocalypse. Set 97 years after a catastrophic global event, the American post-apocalyptic sci-fi television series was created by Jason Rothenberg and is loosely based on the book series of the same name. Produced by Alloy Entertainment, CBS Television Studios, and Warner Bros., the television show explores themes of survival, drama, sci-fi, action, adventure, and crime, starring actors such as Eliza Taylor, Bob Morley, Marie Avgeropoulos, and Lindsey Morgan. As the narrative unfolds over its 13 episodes, characters navigate the challenges of survival on Earth, where the central conflict revolves around the question of who they become in order to survive in a transformed and dangerous world.

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Season 5 Episodes

Episode Guide

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Season 5 Progress Shield

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Binge Efficiency Engine

Season 5: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

23%
77%
Mytharc (3): Crucial lore & season climaxes
Core (10): Character development & subplots
Side Quest (0): Standalone / filler
S5·E1 Mytharc

Eden

Apr 24, 2018

Clarke struggles to survive on a desolate, scorched earth while her friends in space come across a long-awaited beacon of hope.

S5·E2 Core

Red Queen

May 1, 2018

Octavia is forced to take guidance from an unlikely ally when the future of the bunker and all those inside it is jeopardized.

S5·E3 Core

Sleeping Giants

May 8, 2018

Bellamy leads the charge investigating a potential way home. Meanwhile, Clarke and Madi deal with the new, uncertain threat to their home.

S5·E4 Core

Pandora's Box

May 15, 2018

Our Heroes are forced to rely on the help of Shallow Valley's dangerous new inhabitants in order to save some of their own, with surprising results.

S5·E5 Core

Shifting Sands

May 22, 2018

Octavia leads her people towards Shallow Valley against the advice of Clarke and Bellamy. Meanwhile, Kane and Abby adjust to a new set of challenges.

S5·E6 Core

Exit Wounds

Jun 5, 2018

Kane's attempt to prove himself useful tests Wonkru's allegiance to Octavia. Madi faces an unexpected threat inside Wonkru, forcing Clarke to make an unlikely ally.

S5·E7 Core

Acceptable Losses

Jun 19, 2018

Clarke and Bellamy make a startling discovery about Wonkru’s battle plans as Echo risks her friendship with Raven to complete her mission.

S5·E8 Core

How We Get to Peace

Jun 26, 2018

Clarke’s determination to protect Madi puts Bellamy in an impossible position.

S5·E9 Core

Sic Semper Tyrannis

Jul 10, 2018

The growing fractures in Wonkru threaten to explode once and for all. Meanwhile, in Shadow Valley, Murphy starts a fire, unleashing catastrophic results.

S5·E10 Core

The Warriors Will

Jul 17, 2018

Monty strives to show Wonkru an alternative to war, and to the valley itself. Meanwhile, Abby’s health continues to deteriorate, along with McCreary’s patience.

S5·E11 Core

The Dark Year

Jul 24, 2018

As Clarke races to save Abby, she learns more about the trials and tribulations Wonkru faced in the bunker, and the impossible decisions they were forced to make in the dark year.

S5·E12 Mytharc

Damocles (1)

Jul 31, 2018

Octavia leads her people into war. While behind enemy lines, our heroes must overcome their differences to save Wonkru from extinction.

S5·E13 Mytharc

Damocles (2)

Aug 7, 2018

Clarke and her friends must risk everything to fight one last battle for survival, only to glimpse an even darker threat to the last living valley on Earth.