STOP CRITICIZING ME! That's all my mother ever did was criticize me! It was always "Ursula this", or "Ursula that"! Or "Morgana, why can't you be more like your sister, URSULA?!"
~ Morgana furiously ranting about her past as the unfavorite of her family.
I am the queen of the sea and you will bow down before me!
~ Morgana now possessing the trident in her hands.
Morgana is the younger sister of the wicked sea witch named Ursula, whose place she takes as the main antagonist of Disney's 2000 direct-to-video animated sequel film The Little Mermaid II: Return to the Sea, the sequel to Disney's 28th full-length animated feature film The Little Mermaid. Like her sister, she is a cecaelia, a species of water-dwelling (near mermaid-like creatures) but with the bottom half of an octopus and appears in the second Little Mermaid movie together with her minions Undertow, Cloak and, Dagger. She is Melody's arch-nemesis.
Morgana is very skinny, closer to a squid than an octopus. She is younger than her sister, and her skin is light green. Morgana's octopus arms are green instead of purple like Ursula's. Also, her bottom portion of her body resembles a black gown.
When Morgana was young, she was liked less than Ursula by her mother. Morgana got criticized for her jealousy of Ursula. She can release ink from her tentacles. Their mother soon died as revealed by Morgana when she, herself, usurped King Triton's throne, becoming queen herself. A picture of Ursula and Morgana's mother was seen in the deleted scene "Gonna Get My Wish". It is less likely she was banished from King Triton's kingdom like her sister Ursula was though.
The party celebrating Melody's birth is interrupted by Morgana attempting to prove her superiority over Ursula. She attempts to feed Melody to Undertow but fails when Prince Eric and Ariel rescue Melody. So, Morgana and her two manta rays, Cloak and Dagger, leave in a huge funnel.
Morgana, Undertow, Cloak, and Dagger live in an iceberg lair. Morgana is trying several attempts to change Undertow back into a shark, but all fail. Morgana believes that Trident is too powerful for her. It is revealed that Morgana does not like being criticized because her mother criticizes her and tell her she should be more like Ursula. It is also revealed that their mother favored Ursula more than Morgana. Morgana and Undertow argue about whose fault was what about hiding in the lair. Suddenly, Morgana's orb shines and shows her Melody discovering her grandfather's locket, inciting Morgana to use Melody to her advantage.
After Melody discovers her mother's secret from the locket, she runs away from home on boat after her mother refused to answer why she doesn't allow her daughter in the sea. Melody then comes across Morgana's minions who brings her to their Ice Cave. Once she meets Morgana there, Morgana uses her sister's magic to turn her into a mermaid. Melody goes swimming in her new from and then arrives back to Morgana's lair to thank her. After Melody thanks her, Morgana plots by fake-crying. Morgana reveals that the mermaid spell is temporary. Morgana lies to Melody that "her" Trident was "stolen" by a "deranged kleptomaniac" (she's referring to King Triton and his trident) and that "there is no one left to give it back for her". Melody tells Morgana that maybe she could get it back for her. Morgana acts surprised. She shows Melody the map and where the "scoundrel" lives. Melody asks if she means that it wasn't just "an ordinary fish tale" like her mother told her and if it really exists. Morgana says "Of course it exists. Whoever told you otherwise?" Melody tells Morgana that her mother did. Morgana responds that she's sure Melody's mother didn't mean to be cruel and deceitful. Melody says that she will bring back "her" trident and that she can count on her. Morgana says, "Be careful, dear! Enjoy those fins!" Then she says softly with an evil grin "while you can", and chuckles sinisterly.
Morgana sees Melody, Tip, and Dash near Atlantica. Morgana sends Cloak and Dagger to go and make sure nothing interferes with Melody's return.
Ariel and Flounder have followed Cloak and Dagger to her lair. Just as Melody is about to give Morgana the trident, Ariel shows up and stops her, frantically. Melody is angry and shocked that Ariel hid the truth about her locket. Morgana and Ariel are trying to convince Melody to give the trident to each other. But Melody, angry at Ariel for hiding the truth about her locket, gives it to Morgana. Morgana cackles and claims that all the seven seas are at her command. She grabs Melody and put her with her behind an ice wall. Morgana reveals that Ariel was only trying to protect her from her. Morgana confesses that she herself tricked Melody into giving the trident to her and that King Triton is really the king and is Melody's grandfather. Melody realizes the truth. Morgana blames Melody for the theft. She tells Melody that her time as a mermaid has just expired. Morgana then goes to the surface.
Morgana rises to the roof of her own lair on top of her new cliff. Prince Eric, his crew, and Scuttle arrive in battle the now-powerful sea witch. However, Morgana destroys Prince Eric's boat. Prince Eric and his crew are forced to stand on the ice and they survive. King Triton, his guards, and Sebastian arrive in battle the now-powerful sea witch as well. Morgana dares King Triton to hurt her and then cackles. After Undertow taunts Triton, Sebastian chases Undertow, angrily but Morgana transforms Undertow into a gigantic shark and Sebastian manages to flee. Prince Eric takes his sword out and asks, angrily, where Melody is and what she has done with her. Morgana replies "Oh you wanna join your daughter? Well, I think that can be arranged" She commands Cloak and Dagger to take Prince Eric to Melody underwater to drown. Scuttle distracts Morgan and Ariel and Sebastian rescue Prince Eric, while Tip and Dash defeat Undertow (by causing him to smash into a wall, shattering his teeth) and rescue Melody. Sebastian defeats Cloak and Dagger by tangling up their tails.
Despite the heroes' efforts, Morgana still has the power of the trident and forces all the creatures she sees to bow down to her. Melody realizes that she has to get the trident herself since Ariel, Tip, and Dash are forced to bow down to Morgana, and Prince Eric is too unconscious to help. Melody realizes that she has legs and that power of Morgana cannot harm her. Morgana then forces King Triton to bow down. Morgana looks up at the sky and says to her mother that she has finally won. As Morgana sentences King Triton to oblivion, Melody surprises Morgana by snatching the trident from her. Morgana, eventually tries to take the trident away by tying up one of Melody's feet, she lifts Melody upside down and tries to grab the trident back, but Melody pierces the trident through one of her tentacles, distracting and hurting her, so Melody gets free and throws the trident back to Triton.
Morgana pushes Melody off the cliff after she throws the trident to Triton, but Dash saves Melody by causing her to land on his belly.
Triton catches his his trident and says to Morgana, “Never again will you or yours threaten my family. There will be no escape for you — ever!”
Finally, he imprisons Morgana in a small iceberg, which falls off the cliff when her icy fortress starts to sink, dropping her into the cold ocean. Still alive while she sinks, she whimpers “Mommy!” because she realizes that she has failed her mother again by being defeated. The picture of Ursula sinks along with her, a little far behind.
It is completely unknown what happened to Morgana after this, but it is likely that she remained frozen at the iceberg until she starved to death or drowned.
Like her older sister, Morgana is oppressive, cruel, sarcastic and manipulative. She shows that she hates being criticized in the film when she berates Undertow. She wants to steal the trident to prove her superiority over her sister. However, she lacks her sister's deviousness and gets easily upset when she is told that she is not as good as her when using potions, as shown when Morgana fails all attempts to turn Undertow back into a shark, much to her embarrassment. Morgana is shown to have twisted sense of humor, such as at the beginning when she grabbed Eric's advisor, Grimsby and said: "Now, is that fair Gramps, I asked you.". She tickled Grimsby's chin with her fingers and with a nice smile. She then said, "But then whoever said we had to play fair?". Though Morgana's personality is different, she does have the same objective as Ursula. Many people think that she was less interesting than Ursula. However, at the same time managed to hang on to the trident longer than her.
Although she ultimately desired vengeance against Ariel and Eric for their role in Ursula's death, she also simultaneously disliked and envied her sister due to her neglect from her mother, as the latter favored Ursula far more. This dislike is shown when she is shown to have a picture of her late sister where instead of treasuring said item, she fired darts at it out of spite when remembering their mother favored her. Also in a deleted song, she sung about how her sister "blew it!" and lost the trident to Ariel which led to her defeat before stating it was her time to take power.
Morgana and Undertow see that Melody discovered her grandfather's locket, which they decide to take full advantage of.