The Little Mermaid

Season 3 EP 2 " The Little Mermaid - A young mermaid makes a deal with a sea witch to trade her beautiful voice for human legs so she can discover the world above water and impress a prince.Ariel's absent-minded behavior is commented on by her sisters. Overhearing this, Triton questions his advisor Sebastian the crab, who tells him that she saved a human's life. Outraged, Triton travels to Ariel's grotto to confront her; when she refuses to swear to never go to the surface again, Triton destroys her collection of human objects. After Triton leaves, Ariel is approached by a pair of moray eels who show her an image of the sea witch Ursula, Triton's estranged younger sister and Ariel's aunt who was banished from Atlantica 15 years prior and she offers to help Ariel."