The episode centers on William Bell’s megalomaniacal plan to collapse both the "Blue" and "Red" universes.
In the Fringe Season 4 finale, the stakes reach a multiversal breaking point as the series shifts from its season-long conflict with David Robert Jones to the reveal of the true architect: William Bell . The Grand Design: A New Genesis Fringe - Season 4Eps22
: After Walter extracts the bullet and Olivia miraculously heals, the team is told that the Fringe division will be funded once more. The episode centers on William Bell’s megalomaniacal plan
: To stop the collapse, Walter Bishop makes the unthinkable choice to shoot Olivia in the head . Because the Cortexiphan is actively regenerating her brain tissue, the bullet's impact disrupts the energy flow, saving both universes but forcing Bell to flee. Key Reveals & Character Arcs : To stop the collapse, Walter Bishop makes
While the immediate threat of Bell is neutralized, the finale's epilogue shifts the tone. September the Observer appears to Walter, warning that directly setting up the Observer invasion and the dystopian future of the fifth and final season. Fringe: Season 4 Episode 22 - Brave New World Part 2
: The season ends on a personal high note when Olivia reveals she is pregnant with Peter’s child—a moment of hope that contrasts with the dark future teased throughout the series. Setting the Stage for Season 5
: The episode features creepy practical effects, notably Jessica Holt's face contortion, which was performed without CGI by actress Rebecca Mader .