A war was happening between the Delinquents, aka the people from the ark, and The Grouders aka natives who have survived the earth and have been there way before the Ark sent the 100 down.
Raven, the area's mechanic of the ground is temporarily paralysed due to violent John Murphy shooting her while he tried to get revenge on Bellamy Blake for letting the group hang him over a false accusation.
Though John is long gone now as he's managed to escape. And now Finn has left to get an antidote from a friendly grounder named Lincoln, who also happened to be dating Octavia Blake, Bellamy's younger sister.
Hours later Grounders come and start attacking as the clock is ticking ominously.
Raven earlier had the idea to use the rocket, known as the dropship's fuel to go up into the sky for moments at a time to burn all the grounders, which does happen.
Though Finn, {{user}}, Bellamy and a random two people are outside of the drop ship and didn't make it in when the hatchet closed and rose up to the sky for seconds and burnt all the grounders who were fighting.
All the other survivors step out of the little rocket when the whole thing stops, they step outside and look around, until they pass out from red mist, with no {{user}}, Finn or Bellamy in sight, at all.
Once the crew wakes up in a new unfamiliar place though there's still no sign of Raven, Finn, {{user}} or Bellamy at all. Perhaps they're dead...
So in the meantime, lets see what {{user}}, Bellamy, Finn and Raven are at.
John Murphy, the man who shot Raven came back to the drop ship where Raven was alone, alone and slowly dying. They have a depressing conversation about John's past where he reveals that his father stole medicine for him to keep him alive, medicine that wouldn't have worked anyway. His father was caught and floated and his mother started drinking herself to death. Before Murphy found her dead, she had told him that it was his fault his father was dead.
Bellamy, Monroe, and Sterling are following Finn and Tristan, aka a savage member of the Grounders who are currently the enemies of the 100.
He tells them he'll distract Tristan while they free Finn and tries to encourage them by reminding them that they're warriors. Bellamy runs out and confronts Tristan, throwing a spear at him, but Monroe and Sterling abandon him, and so does , apparently... Tristan beats up Bellamy and takes him captive, too.
But soon survivors/security of the Ark found Bellamy and a second in command to chancellor Jaha on the ark now on earth with a few guards shoot Tristan and help out the crew they found.
After a bit Bellamy shows the guards the dropship and then the whole little group finds John and Raven and takes them in.
Soon the new group arrives at the remains of a new ship that was sent from space which got Kane and other workers down.
Bellamy and John are also immediately sent to the make shift jail and are tied up by one of their wrists.
Raven undergoes surgery to get the bullet out of her spine with the help from doctor Abby, as Finn stays by her side.
After surgery Abby leaves and Raven and Finn chat quietly, Raven, before she falls asleep says that she wants Finn out of here to search for their friends. So he does and gets the help from a few people and plans to get Bellamy free.
Once managed to get to the make shift jail, Finn enters and after some lighthearted talk Finn cuts the wire that bound Bellamy's wrists. John is still tied at a moment. Though Bellamy does act Finn to cut his wire off of the metal poles but Finn declines... What happens next..?