Charlotte and Charlotte2 in “Unfinished Business”

You're from another world? What do you want?

I'm here to guide you into the light. There are two groups out there fighting for superiority in time travel. Light and dark. I want you to join our side. Eva's side.

Eva?

I know you thought you could trust him, but you can't do that.

Who?

Jonas. He belongs to the dark.

Jonas? He's dead.

No. He's not. He wants to destroy both worlds forever and untie the knot. He doesn't know that death is what he'll want in the end. But all his impulses on this journey will lead to that end. But Eva wants to save both worlds.

I don't understand. Jonas said we could change it. We change one component, we change the entire world.

It was you who told him that. Your older self. A positive feedback loop. Jonas opened the passage in 2020. The older Jonas had previously shut it in 2019. After it'd been opened in the summer of 1986 for the first time. In all three moments, they left behind traces of cesium residue, a component of the black matter. Half-lives. In every cycle, at each of these three moments, this cesium is carried through the tunnel and back before it's completely decayed. It exponentially expands endlessly. So the passage is the result. It must continue to exist forever. Everything has to happen again. Jonas has to bring the matter to the passage. And opening one of the nuclear plant barrels has to trigger the apocalypse. Everything in this loop repeats. Life...and death.