The 100 Season 4 Recap: Everything You Need to Know About the Teenage Lab Rats’ Adventures and More

One thing that makes people keep coming back for another dose of The 100 is the fast-paced plot progression and unpredictability. The 100 Season 4 begins with bad news: the world is once again on the brink of a nuclear apocalypse. Survival comes down to three methods: devise a Nightblood transfusion so no one is affected by the radiation, find an underground bunker large enough to house all the clans, or go back to the remnants of The Ark in space. Long story short, the disaster does happen. But before that, every episode offers an entertaining journey of teamwork, betrayal, fears, love, and murders. Here is a recap of The 100 Season 4!

The 100 Season 4 Recap


Clarke cannot stop thinking about A.L.I.E.’s warning over an impending nuclear disaster. If there is any truth to that, humans don’t have much time to prepare everything to save the civilization – or what’s left of it. She also gives the Flame to King Roan, establishing his place as the temporary leader of all 13 clans until the next Commander comes along. Clarke, Jaha, and Bellamy discuss the next best move to stay safe from the looming radiation. Raven discovers that the warning is indeed true based on historical records.

Heavy Lies the Crown

Kane and Abby have their romantic moments; not many events of any greater importance happen in the episode with a few exceptions. One of them is that Clarke, Bellamy, Harper, and others want to bring Alpha Station back in full form, potentially giving humans a chance of survival. They obtain a hydro-generator from the Farm Station, too. Clarke tells everyone about the warning, the radiation, and the real possibility of another apocalypse.

The Four Horsemen

Jaha takes Clarke and Bellamy on a search for the Second Dawn Bunker, which can be used as a safe refuge during the apocalypse. Luna – the pacifist leader of the Boat People– arrives at Arkadia, showing signs of radiation syndrome. It turns out that Luna is the only remaining survivor of her clan, thanks to her Nightblood. Such a peculiarity is not missed by Abby, who sees an opportunity to save everyone. Meanwhile, Gaia the Flamekeeper steals the Flame.

The 100 Season 4 Recap

A Lie Guarded

Abby, Rave, Luna, and Murphy discover a method to fully utilize the Nightblood to create immunity against nuclear radiation. They are attacked by drones, leading Luna to almost absolute madness. Octavia has a terrible accident on the cliff, but she miraculously survives.

The Tinder Box

Raven and Abby realize they still have some bits of A.I. knowledge left in their brains. After some relatively uneventful digging into their own minds, the two come to a conclusion that the Nightblood can be manufactured on the Ark. They soon find a rocket and prepare for a journey back to space. King Roan plans to take over the ship, but Octavia figures it out. Clarke and King Roan reach an agreement to share the already dwindling resources at Arkadia. Ilian, a previously A.L.I.E.-controlled Grounder, sabotages and detonates the ship.

We Will Rise

The people of Arkadia think Ilian’s crime is punishable by death. Octavia is willing to take the honor as the executioner, but Kane intervenes and all is well. Raven is doing what she does best to repair the spacecraft while waiting for a delivery of hydrazine fuel from Clarke, Bellamy, and Roan. One of the barrels is pierced and emptied following an ambush. When the words of a damaged fuel barrel reach Raven’s ears, she has a seizure.

Gimme Shelter

The disaster is getting terrifyingly real now that black rain is pouring down from the sky. The unlikely couple, Ilian and Octavia, are trapped in a cave and they have sex. Abby and Clarke are having a serious discussion at an underground lab on Becca’s Island about using Luna’s bone marrow in an attempt to reproduce Nightblood, which means they need a test subject. As it happens, Emori claims to have captured a thief named Baylis to be used as a lab rat. The convenience vanishes in the blink of an eye when Emori admits to lying about Baylis being a thief.

The 100 Season 4 Recap

God Complex

Clarke decides to volunteer as the test subject, so she injects herself with Luna’s bone marrow. Nothing seems wrong up until this point, but the real test only happens when she is exposed to a high level of radiation. Abby destroys the radiation-emitting machine before Clarke can use it. Gaia the Flamekeeper helps Jaha discover the location of the Second Dawn Bunker, beneath the city of Polis.


News of the Second Dawn Bunker discovery spreads like wildfire, inciting restlessness among the clans. Clarke assumes leadership to prevent the bickering from escalating into a violent conflict. It makes sense because she is now a Nightblood due to the bone marrow transfusion, but then again Roan disputes the claim for the same reason. He calls for the Final Conclave to determine the true Commander. Raven cannot be bothered with all that action as she keeps herself busy repairing the spaceship.

Die All, Die Merrily

The Final Conclave officially begins. Luna takes part although she declares no one will share a place with her in the bunker if she wins. The declaration can theoretically disqualify her chance as a Commander, but no one seems to mind. It does not matter because Octavia is the last person standing at the end. She allows every clan to choose only 100 members to stay in the bunker.

The Other Side

Those who realize their slim chance of ever getting into the shelter go about committing mass suicide. Raven, confused by hallucinations, engages in a self-reboot mechanism to get rid of all of A.L.I.E.’s remaining influence in her brain.

The 100 Season 4 Recap

The Chosen

Clarke shows symptoms of radiation effects, an indication that her Nightblood transfusion has no benefit. Harper and Mounty take anybody they can to the underground lab. They also have a plan to go back to the Ark.


With deaths overshadowing Polis, everyone at the lab is ready to launch the spaceship. Unfortunately, Clarke has to stay behind because she needs to power up the Ark from a satellite tower. The good thing is that she arrives back at the lab just in time. Fast forward to six years later, Clarke is still alive mostly because she has truly become a Nightblood. A spaceship, more specifically a prisoner transport, lands on Earth.

We think the inevitability of the impending nuclear-related extinction event brings the show back to its true form, in which there is never an easy choice between all the bad options. Things quickly go south when everything appears to be alright, let alone in perilous circumstances. Nothing is ever truly fine in The 100 where one person’s survival is likely outweighed by somebody else’s. Sometimes, one must turn to the ultimate dark side just to stay alive.

Have you finished watching The 100 Season 4? Do you find it impactful to the series or problematic? Let us know. We’d love to hear from you.

Other things you might want to know:

How many of the original 100 delinquents are left by the end of Season 4?

There are at least six of the original 100 delinquents confirmed alive. Three of them are on the spaceship going to The Ark, two in the Second Dawn Bunker, and another in the Shallow Valley. However, there have been 60 confirmed deaths at this point, meaning the survival status of the other 34 remains unknown.

Did everyone outside the bunker die?

Yes, they did, except for a few who managed to find good enough shelter outside. Clarke was not in the bunker, but she ended up alive at the end of the season. That said, her Nightblood might have contributed to her survival.

Where to stream The 100 Season 4 now?

Season 4 originally aired on The CW from February 2017 to May 2017. The season (and the entire series) remains available on streaming services including Netflix and DirecTV. You can also watch it on Apple TV, Amazon Video, and Vudu.

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