Complete story — includes the ending
The Fringe team grieve over Etta's death. Meanwhile, the Observers receive a shipment from the future through a wormhole. The Resistance plans to destroy the next shipment; they have also captured an Observer. Peter interrogates him, trying to find out how to assemble a cube-shaped power source used by the Observers to initiate the shipments. The Observer does not cooperate, and the attempt to disrupt the shipment fails. Peter returns to the Observer and forcibly removes his implant, thereby killing him. He inserts the implant into his own neck to gain the same capabilities that the Observers have.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Fringe season 5. HTML formatting and reference markers removed. · Content license