Let’s watch Barbie Movie Preview: Barbie Mermaid Power
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Warning: spoilers ahead
Quite simple, my theory is that Marlo is a descendant of Eris from A Mermaid Tale. If we consider this timeline, and say that Malibu is a descendant of Merliah, this would explain why Marlo's crown gave powers to Malibu: because she was born with powers and not Marlo, just like Merliah and Eris.
Thoughts?