If you don’t want to know anything about the upcoming season of Fringe, please turn back now. Our next story has SPOILERS.

In the third season finale of Fringe, we saw the series flash forward to the future. Producer Jeff Pinkner says that we’ll be going there again this season to see the impact of Peter not being part of the story.

The future that we saw in 2026 will now not have happened, because by altering the past, inevitably you set in motion a new chain of events that lead to a different future,” Pinkner tells TV Guide.

The executive producer also revealed that the fourth season of Fringe will include more glimpses into the past.

“There will definitely be [flashback] episodes, but the past would be different as well because Peter wasn’t a part of it,” he said.