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It is a phenomenal season finale that manages to provide closure for the immediate threat while pivoting the entire series toward its final, dark chapter.

It ties up the "Bell vs. Bishop" rivalry that had been simmering since Season 1. Cons:

This is John Noble's episode. His transition from a man terrified of his own shadow to someone willing to kill the person he loves most for the greater good is heartbreaking. Fringe_4x22_Il_Coraggio_Di_Un_Nuovo_Mondo_Secon...

While often sidelined, her moments of support for Walter in this finale highlight her role as the emotional anchor of the lab.

The visual effects of the collapsing worlds provide a grand scale. It is a phenomenal season finale that manages

The climax is one of the most shocking moments in the series. Walter realizes the only way to stop the collapse is to eliminate the power source—which happens to be Olivia, fueled by .

This moment is masterfully tense. Watching Walter make the choice to shoot Olivia in the head to save the world is a brutal reminder of his "old" personality's ruthlessness. However, the immediate "revival" via the Cortexiphan healing her brain feels slightly like a deus ex machina , though it fits the established lore of the drug. Key Character Arcs Cons: This is John Noble's episode

The resolution of Bell’s plan feels a bit rushed in the final ten minutes.