Jilted bride Laura arrives on the island still in her wedding dress, having just been stood up at the altar. She's never felt worse in her entire life, and her fantasy is to just feel better. The Island surprises her with her childhood imaginary friend, Peaches, in real human form and helps Laura rediscover that her inner child is exactly who she needs to move on from her heartache. Isla tells Ruby about the complicated past between her people and the Roarkes.

Sue, Jenna and Brooklyn are the first, second and third wives of Gavin, a charming doctor who's made a fortune selling all-natural vitamins—and broken all of their hearts along the way. Now, they all share the same fantasy: they want Gavin to understand— to feel for himself— the pain he's caused them all. Meanwhile, Roarke brings Ruby's youngest daughter, MJ, to the Island to help Ruby remember who she is. And hopefully keep her from disappearing into the ocean forever with Isla… as a mermaid.