| When Ursula first appears in the film, she states through a monologue that she once lived in the royal palace of King Triton, the king of the underwater city of Atlantica. She was banished from Atlantica and made her home in the remains of a leviathan where she waits the chance to get her revenge on Triton and become Queen of Atlantica. She currently resides in a leviathan home lined with a garden of writhing polyps which were merfolk who had previously gone to Ursula for help, but found themselves unable to fulfill their side of the bargain, leading Ursula to claim them as her own and added them to her collection. Though she remains powerful, Ursula laments her distaste for her living conditions, and secretly watches over King Triton's youngest daughter, Ariel, believing her to be "the key to Triton's undoing". With time, Ursula's assumptions are proven correct, as Ariel one day meets and falls in love with a human prince, named Eric, against Triton's explicit rules.
Ursula commands her minions, moray eels Flotsam and Jetsam, to lure Ariel to her lair, claiming that only she can help make the princess' dreams of living on the surface, beside her apparent true love, a reality. Little does Ariel realize that this is part of Ursula's scheme to take the kingdom. Through the song "Poor Unfortunate Souls", Ursula proposes an agreement where she will transform Ariel into a human for three days, during which Ariel must receive the "kiss of true love" from Eric. If Ariel succeeds, her transformation into a human will be permanent, but if she fails, she will turn back into a mermaid and be bound to Ursula for eternity. The price for the transformation is Ariel's voice (which Ursula will keep no matter what happens). Ariel agrees and signs a contract that Ursula has conjured. As Ursula orders Ariel to sing, the sea witch summons magical hands to rip out Ariel's voice, which is then magically pulled into Ursula's Nautilus shell necklace. She then laughs gleefully as her plans begin to unfold: Ariel's tail is split into legs. As she laughs, Ursula allows Sebastian and Flounder to take the human Ariel to the surface. During the time that Ariel is a human and must win a kiss of true love from Eric in order to remain human permanently, Ursula takes every measure to prevent the kiss from occurring, such as when Flotsam and Jetsam tip over the boat in which Ariel and Eric are sitting as the two are close to kissing. Realizing Ariel is doing a much better job earning Eric’s love that she thought she could do and thus, will definitely share a kiss before the deadline, Ursula decides to take matters into her own tentacles. With intent to sabotage Ariel's relationship with Eric so she can continue with her evil plan, Ursula takes the form of a beautiful human female with Ariel's voice. Under the alias "Vanessa", Ursula hypnotizes Eric into forgetting all about Ariel and marrying her. However, Ariel's seagull companion, Scuttle, discovers Ursula's villainy and quickly alerts Ariel and King Triton's court composer, Sebastian, who rushes off to alert the king. Before she can completely misdirect Eric into marrying her, Scuttle is able to stall the wedding for the time being and, in the chaos, destroy the Nautilus shell containing Ariel's voice, breaking Eric’s trance and returning Ariel's voice to its rightful owner. However, the sun sets before Ariel and Eric can kiss and Ariel transforms back into a mermaid. Ursula changes back to her true form, grabs Ariel and jumps back into the sea, where she is confronted by King Triton.
Ursula reveals her true goal and forces Triton to choose between his freedom and his daughter's. Triton agrees to take Ariel's place, and once Triton is transformed into a polyp, Ursula takes his crown and trident. Furious with Ursula's trickery, Ariel attacks the sea witch, who immediately retaliates and threatens to destroy the former with the power of the trident. Before she can, Ursula is attacked with a harpoon by Prince Eric. Flotsam and Jetsam are sent to capture the Prince and successfully do so while dragging him down into the sea before Sebastian and Flounder rush to the prince's aid. Ursula readies a killing shot for Eric, but Ariel grabs hold of her hair, thus redirecting the blast towards Flotsam and Jetsam—killing them. Saddened and enraged by the death of her minions, Ursula seeks vengeance on Ariel and magically alters herself to a massive size. With her new form, Ursula declares herself as ruler of the entire ocean and creates a powerful storm. Eric takes control of a surfaced ship while Ursula's attention is on Ariel. As Ursula wickedly taunts the idea of "true love" and prepares to kill Ariel using the power of the trident, Eric impales the sea witch by plunging his ship's splintered bow through her abdomen. Ursula screams in pain, and the bow catches lightning, brutally electrocuting her body. As Ursula loses her last ounces of life, she drops onto the ship and sinks into the sea as her dismembered body falls to the ocean floor.
After Ursula's fate is sealed, all the merfolk that have had been under her power, including Triton, are released from their bonds and transform back into their original forms. With Ursula and her minions gone for good, her contracts lose their validity, Ariel is able to return to her human form, and she and Eric are finally able to kiss for the very first time, marry, and live happily ever after.
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