“Eden” is episode one of season five of The 100.
In the season four finale, “Praimfaya”, Murphy, Emori, Harper, Monty, Raven, Bellamy, and Echo managed to get to the Ark, although Clarke was left behind. She managed to make it into Becca’s lab but was badly burned by the radiation Those of the other who survived did so in the Second Dawn bunker; everyone else presumably died.
Six years and seven days later, Clarke is still alive (boy, she is really hard to kill) and is on the only green bit of planet, together with a young girl. Clarke has been trying to contact the Ark, saying that it has been safe for a year, but there is no response. The Second Dawn bunker is not responding either.
A pod is seeing coming down from the sky, but it is far bigger than expected. When Clarke viewed it through the scope of her rifle, it was labelled ‘Elgius Corporation’ and ‘Gagarin Prisoner Transport.’ Clarke considered these alarming and told the girl, Madi, to go and get all the guns.
This episode begins well before then, in space with an external view of the Ark before a look at the brown and devastated planet below and zooming in to Alie’s island below. It’s 42 days after Praimfaya and a mostly-healed (really, really hard to kill) Clarke is clambering out of the wreckage that was the entrance to Becca’s lab. She gets a map and plans to leave the island – although it’s no longer an island, as all the water has gone – to get to the bunker.
Clarke finds some markers and digs a rover out of the sand and makes her way to Polis. The tower, under which the bunker is located, has been flattened. Clarke attempts to dig her way to the entrance, but a collapse shows her that this is impossible. At which point she starts narrating, saying that until this point she thought she would get into the bunker with her mother.
Clarke drives to Arkadia, which is also ruined, but rather than food and water she simply finds things left by Jasper. The world is dead; the previous world was alive. Weird life perhaps on occasion, but alive. Clarke’s narration is actually her on the radio trying to communicate with the Ark.
Not quite everything is dead, and Clarke keeps going by eating some bugs. Then a dust storm filled with electricity hits the rover. Which is powered by solar cells. Which do not take well to this. Leaving Clarke on foot. Out of water, out of hope, Clarke is about to commit suicide when a raven leads her to a valley that is still alive.
The valley has the former town of Shenandoah and was the home of the Shadow Valley Clan. The valley was spared the destruction of the Death Wave; the people did not survive the radiation. Clarke eventually spots a young girl, who she assumes is a Nightblood to have survived, one not found by the Flamekeepers. This is a young Madi. The initial encounter does not go well; Madi tries to kill Clarke until she discovers that she, too, is a Nightblood.
Six years later and we’re about up to where the previous season ended. Finally, we see something from the Ark. Everyone is still alive, although Murphy is, once again, not Mister Popular. Those on the Ark see a ship appear, the ship from which the dropship that Clarke saw at the end of “Praimfaya” comes from. Those in the ship look as if they are probably not nice people. Although the term ‘Prisoner Transport’ was probably a bit of a giveaway; it implies the presence of prisoners. Prisoners who were not kept on Earth, so are perhaps bad ones, and prisoners always outnumber guards.
The Second Dawn bunker is not shown until the very end. Things do not look good in there either.