My best guess based on another good series with a similar 5-season arc, the 3rd season would have been when the main characters realize Rossum's larger plans (Topher's breakdown when he puts together schematics from the individual Dollhouses, or the visit from one of the execs using Victor's body, for two examples that did make it into the series), 4th season would have been the dark one when everything goes to crap, and 5th season would have been the hopeful restoration of Epitaph One / Two.
The only thing I remember reading for sure is, the 2nd season would have largely been about exploring what was happening to Echo because of what occurred in the 1st season aired finale (episode "Omega") - which did happen, but it I don't remember it dominating the season. Didn't sound like it would have been a dark season, but looking back on it seems like it would have been painfully slow.
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My best guess based on another good series with a similar 5-season arc, the 3rd season would have been when the main characters realize Rossum's larger plans (Topher's breakdown when he puts together schematics from the individual Dollhouses, or the visit from one of the execs using Victor's body, for two examples that did make it into the series), 4th season would have been the dark one when everything goes to crap, and 5th season would have been the hopeful restoration of Epitaph One / Two.
The only thing I remember reading for sure is, the 2nd season would have largely been about exploring what was happening to Echo because of what occurred in the 1st season aired finale (episode "Omega") - which did happen, but it I don't remember it dominating the season. Didn't sound like it would have been a dark season, but looking back on it seems like it would have been painfully slow.