Special Guest Star
- Ryn learns that Helen is, in fact, a fellow mermaid when she sees the exact same flaky, scaly marks on Helen's left arm.
- Helen: "Why did you and your sister come so close to the surface? You know better. I'm sure you've been warned."
- Ryn: "Food."
- (after Ben picks the lock of Donna Stevenson's front door)
- Xander: "What, they teach you that in college?"
- Ben: "No. Grad school."
- Decker: "She knew to put clothes on. All this time, we thought we were studying her. She was studying us."
- Ryn: "Your father a hunter?"
- Maddie: "He only hunts bad people."
- Ryn: "I am not bad."
- Ben: "That girl."
- Maddie: "Her sister. She found her."
- Break Apart by Bonobo feat. Rhye
- Crying Shame by The Teskey Brothers
- Midnight by The Blue Stones
- Enemies by Hawk Eyes
- Goodnight Sisters by Michael A. Levine
- ↑ SpoilerTV — "Final Adjusted TV Ratings for Thursday 12th April 2018" (April 13, 2018)
- ↑ SpoilerTV — Freeform's April 2018 Programming Press Release (March 27, 2018)
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