Plotting a Season Arc Before a Single Scene Exists
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Long before individual episodes are written, a writers room typically maps an entire season's shape in advance, deciding where major turns will land and how the story should feel by the time it reaches its final hour, well before any specific dialogue has actually been drafted.
This early mapping exists to prevent a season from drifting. Without a clear destination in mind, individual episodes risk feeling disconnected from one another, so a season arc functions like scaffolding, holding the shape steady while individual writers fill in the specific scenes and dialogue later.
Even with careful planning, arcs frequently shift once production begins, adjusting for an actor's strength, a scene that plays differently than expected, or simply a better idea discovered along the way. The original plan matters less than the discipline of having built one in the first place.