: Because Meredith's human anatomy was incompatible with the needs of a mermaid infant, she suffers heart failure and passes away shortly after the birth.

While life begins in one part of town, are tasked with managing the aftermath of a death.

: Xander’s perspective shifts as he trains for the water patrol, vowing to protect his loved ones despite his growing wariness of mermaid-related chaos. The Secret Project: Ben’s Transformation

: During the cremation of Brian's corpse, the flames burn green. This scientific anomaly suggests that hybrid blood has a unique chemical composition, likely containing copper (II) ions .

The central plot revolves around , a hybrid who served as an unwitting surrogate for Ryn's stolen egg. In this episode, Ben and Maddie must assist Ryn in guiding Meredith through a high-stakes, life-threatening delivery.

Away from the main group, continues his clandestine self-experimentation.

: The baby is born in human form but must eventually be taken to the water to transform and survive. The Fallout: Covering Up a Murder

: Ben discovers that the stem cells he injected into himself are working when a cut on his hand heals with supernatural speed, mirroring the regenerative abilities of the merfolk. Rising Tensions: Tia's War Siren Season 3 Episode 4 | AfterBuzz TV