Disney's The Little Mermaid Jr. follows Ariel, a young mermaid princess, who longs to leave her underwater kingdom and explore the human world. Driven by her fascination with humans and love for Prince Eric, she makes a deal with the evil sea witch Ursula to trade her tail for legs. However, the deal comes with a price, and Ariel must navigate a challenging situation to win Prince Eric's heart and regain her voice.