Biographical Information



Enchanted Forest



Show Information
First mentioned

Skin Deep

First appearance

The Heart of the Truest Believer

Latest appearance

The Jolly Roger


Mermaids are a humanoid species featured on ABC's Once Upon a Time. They are native to Enchanted Forest and Neverland, and first appear in the first episode of the third season.


Before First CurseEdit

In the Enchanted Forest, a mermaid named Ariel pulls a man, Prince Eric, to safety after he nearly drowns from a shipwreck. Despite falling in love at first sight, she leaves before he wakes up. ("Ariel")

A year later, Ariel hears of the upcoming the upcoming the Under the Sea celebration in honor of the legendary sea goddess Ursula. She attends in the hopes of meeting Eric with the help of a myth, which states that at the rising the high tide until the next one occurs, merpeople have the ability to walk on dry land. After saving Snow White's life, Ariel and her new friend head to the party. At the Ball, Eric waltzes with Ariel and invites her to join him tomorrow for a travelling expedition. While she discusses the matter with Snow White, the Queen spies on them through a mirror. Upon discovering the mermaid desires to be with Eric, the Queen impersonates Ursula and tempts Ariel with a magic bracelet that will allow her to stay human. As a price, whoever wears the bracelet will take her place as a mermaid. In a misguided attempt to help Snow White escape the Queen, Ariel clasps the bracelet on her so the ex-princess can live under the sea. After learning of the deception, Ariel stabs the Queen in the neck and flees with Snow White. In mermaid form, Ariel swims to meet Eric at the castle balcony, but she is silenced due to her voice being stolen by the Queen. Thus, Eric leaves without noticing her. ("Ariel")

At another time, the Evil Queen goes to Rumplestiltskin's castle to discuss with him a deal with a particular mermaid. The conversation is cut off when Rumplestiltskin asks her to leave, to which she does. ("Skin Deep")

After First CurseEdit

Using a magic bean, David, Emma, Hook, Mary Margaret and Mr. Gold travel aboard the Jolly Roger to rescue Henry. As they sail towards the island of Neverland, Mr. Gold mysteriously parts from their group and the ship is soon under attack by a school of mermaids. Regina scares off the horde with fire magic while Emma and Mary Margaret catch a mermaid on a fishing line. Once the creature is pulled onto the deck, an argument ensues about what to do with it. While they are distracted, the mermaid blows into a conch shell. In doing so, she causes an incoming storm, which gradually worsens due to the growing tensions between the ship's party members. Much later, Emma discovers the real reason for the storm, and risks her life to push the group into working together; thus helping to calm the sea. ("The Heart of the Truest Believer")

Fed up with Emma's decision to investigate Pan's claims that Neal is alive, Regina separates herself from the group and finds Mr. Gold in the jungle. After shaking some sense into him, they team up to fight against Pan. Mr. Gold mentions there might be a way to contain Pan, but alas, the weapon is back in Storybrooke. To find a way to retrieve the item, they go to the riverside where Regina uses a conch shell to summon the mermaid Ariel. As Ariel has the capability to swim between worlds, Regina wants her to go to Storybrooke and bring the weapon to them. To placate the mermaid, she returns Ariel's lost voice. Regina also promises if Ariel goes to Storybrooke, she will find Eric. ("Ariel")

Swimming into Storybrooke, Ariel gains Belle's assistance in finding Pandora's Box, which can help Mr. Gold defeat Pan. They are sidetracked by Pan's minions, John and Michael Darling, who attempt to destroy the box. Later, the two brothers admit they are only following Pan's orders because he is holding their sister, Wendy, prisoner. Belle convinces them that Mr. Gold is their only hope of saving Wendy, which they agree with. Ariel returns to Neverland to deliver the box where she begs Mr. Gold and Regina to rescue the Darlings' sister. Afterwards, she returns to Storybrooke and reunites with Eric at the dock. ("Dark Hollow", "The New Neverland")

Before Second CurseEdit

Once Regina stops Pan's curse, all the residents of Storybrooke, excluding Emma and Henry, are sent back to the Enchanted Forest. While searching for her beloved Eric, Ariel learns he has been kidnapped by a pirate captain of the Jolly Roger. Believing Hook is the culprit, she confronts him and discovers the ship was previously taken by another pirate named Black Beard. After much searching aboard, Eric is nowhere to be seen. As a trade, Black Beard vows to return Eric if Hook gives up trying to reclaim the ship. Coldly, Hook refuses, throwing Black Beard to the sharks, as he believes Ariel shouldn't waste her time looking for a lost loved one. Angrily, Ariel leaves to continue the search alone, and eventually finds Eric on Hangman's Island. ("The Jolly Roger")

During Second CurseEdit

In order to weaken Emma's light magic, the villainous Zelena disguises herself as Ariel; knowing of the mermaid's prior run-in with Hook, in which he refused to help find Eric. Fabricating Eric's death, "Ariel" mourns the loss as a guilty Hook confesses what he did a year ago in the Enchanted Forest. As proof he still believes in love, she asks him to swear on the name of the woman who broke his heart. No sooner than the words "Emma Swan" come out of Hook's mouth, Zelena curses his lips; ordering him to kiss the savior and strip her of light magic. ("The Jolly Roger")



Note: "Archive" denotes archive footage.