The Nuclear wave finally took over Earth in 100 season 4 finale as our favourite crew, including Octavia, Clarke, Raven and Bellamy made their last efforts to ensure their survival.

In 24 May episode titled Praimfaya, Octavia and a group of Grounders, including the 13th clan, found shelter in a bunker underneath Polis. While, Clarke, Raven, Bellamy, Monty, Harper, Murphy, Emori, and Echo planned to go up in space to evade the deadly waves.

Clarke was faced with a difficult choice as she sacrificing her life to ensure that her friends make it back into space. "My fight is over" she claimed. However, in the final 5 minutes of the episode the show flash forward to 6 years, wherein we found out that Clarke has survived and is now with living another young nightblood named Maddie.

However, they might not be alone as another unknown spaceship, carrying prisons, begins to descend on Earth. Showrunner Jason Rothenberg teases the big time jump and what is next in store for the fan-favourite characters.

Rothenberg told Entertainment Weekly, "Time jumps are designed to be just that — to jump over some time. But I take your point. The time that we're skipping is highly dramatic. [They spent] six years under the ground being forced to figure out how to survive. They realise that they're stuck under there as Clarke tells us at the end of the episode."

Teasing Octavia's fate, the showrunner explained, "That's going to be a story that we want to see. When we see Octavia at the beginning of season 5, it's a pretty big "WTF" moment, and we're going to want to know how she got there, so ultimately we will flash back and tell some story in the bunker and likewise in the ring."

The 100 season 4 finale
Clarke and Bellamy in The 100 season 4 The CW

Season 5 will also feature space flashbacks, according to the creator. He told the outlet, "When we go into the ring in season 5 and we see how Bellamy and Raven and Monty and the others have made it, we'll be very surprised by what we find up there. Ultimately, we'll want to tell some of the stories of how it happened. And flashbacks are part of the DNA of the show, too, so it's not like we're like, "Oh, we're going to do flashbacks for the first time." We always do flashbacks!"

The spaceship that we saw at the end moments of the episode is a threat. Rothenberg explained, "It will for sure be a threat. What I like about it is it's full circle, really. The 100, when they came down, were prisoners. They were the prisoners coming down to an earth that they thought was uninhabited. And they realised that they weren't alone. Now, these prisoners are coming down and we will tell the story of how much or little they know about what they're coming down to."