Morgana always plans and plots within her cave where she calls home.
Melody, daughter of Ariel and Eric, was led to the sea witch Morgana by her evil sidekick Undertow so she can asked her for her help. She told by Undertow that Morgana has great magic powers. Morgana than turned Melody into a mermaid but temporarily as part of her plan to manipulate the young girl to steal the trident that belonged to her grandfather, the sea king Triton of Atlantica.
Morgana after successfully tricked Ariel's daughter Melody into getting her grandfather's royal trident for her, rose out of her ice cave and declared herself queen and ruler of the seas. She magical made her cave into a huge icy palace while she wields the trident. Melody retrieved the trident back from her and returned it to her grandfather, Triton, who imprisoned Morgana in a block of ice, which slowly sunk to the bottom her crumbled sea cave.