Luther’s acceptance of his situation and his romantic relationship with Sloane in The Umbrella Academy season 3 were disserviced, as their strong bond was a rare instance of healthy relationships within a dysfunctional family. Luther should have turned the timeline upside down to bring Sloane back, but due to time constraints or narrative convenience, this doesn’t happen.
The Umbrella Academy ends with a final timeline reset, bringing back deceased characters like Sloane. However, all 43 super-children were created by Sir Reginald Hargreeves, who erased the marigold from existence. The Cleanse consolidates the multiverse into a single timeline, making it impossible for any Hargreeves sibling from any Umbrella Academy version to be alive when the show ends.
The marigold in The Umbrella Academy is a symbol of the lost siblings, a forgotten soul in a multiverse that no longer exists after the series’ ending. If the marigold had not existed, Sloane would not have been born or created in the final timeline.
Where could Sloane be?
As The Umbrella Academy didn’t explain what could have happened to Sloane or where she could be, viewers have come up with a couple of theories. One suggests that Sloane doesn’t exist in this new timeline because Allison wanted it that way. Part of the deal between Reginald and Allison could have been having her daughter and Ray in the new timeline and getting rid of Sloane, further establishing herself as the other villain of season 3.
Another theory explains Sloane might be a prisoner at Hotel Oblivion, and others believe Sloane’s marigold was used to bring Reginald’s wife back. Other theories suggest Sloane is alive, but her memory was wiped, which could have also been part of Allison’s plan, and she could even be under Reginald’s control in the new timeline
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