Everyone always thought Percy's sister was his biological sister. What if she was actually his adopted sister? What if everyone found out she wasn't who she said she was?
In which the fates make everyone watch Percy's adopted sisters past & future.
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The Bestie & Daughter of Athena Alexandra Daddario as Annabeth Chase "We're besties. But, ever since Percy went missing, we've gotten as close as sisters."
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The Friend & the Satyr Brandon T. Jackson as Grover Underwood "Marina, your my friend. I'm going with you."
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The Best Friend, Sister in all but Blood & Daughter of Ares Leven Rambin as Clarisse La Rue "You're my sister in everything but blood. I'm not leaving you behind, Mar!"
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The Pinecone Face & Daughter of Zeus Kaya Scodelario as Thalia Grace "Stop calling me pinecone face, fish face!"
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Her Roman Bestie Victoria Justice as Reyna Avila Ramírez-Arellano "Cordi, who's the blonde hottie?"
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Her Blonde Superman Bestie Who Flirts With Her Ross Lynch as Jason Grace "Piper! How's Marina doing!?"
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The Beauty Queen Sister Laura Marano as Piper McLean "Well, she's taking care of Teddy."
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The Mechanic Best Friend Tyler Posey as Leo Valdez "Marina, never leave me with Percy and Annabeth again!"
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The Honorary Sister/Huntress Crystal Reed as Calypso "Marina, please never leave me with the idiots alone by myself again!"
