Rowan Longworth

The thrilling worlds of Fringe come to a mind-blowing end in the 100th episode and two-hour series finale as the team faces off against the Observers in one final battle.

A key piece needed to defeat the Observers is uncovered.

Walter enters the lab's deprivation tank to uncover information about the mysterious Donald, while Windmark sets out on a revealing mission of his own.

Trying to recall his plan, Walter takes an LSD trip down memory lane. Meanwhile, Peter and Olivia trace a mysterious signal into the woods, where they come upon a grisly scene.

The thrilling worlds of Fringe near the end in the first part of a two-hour series finale as Olivia embarks on a dangerous and otherworldly journey into the unknown.

As Peter, Olivia, Astrid and Walter scramble to tap into a key piece of the puzzle to defeat the Observers, they enlist the aid of Nina Sharp who conjures up a plan.