The Little Mermaid (1992)

S01E11 Thingamajigger

When Prince Eric accidentally drops one of his boots into the ocean, Ariel discovers it and is captivated by what she believes is a fascinating human object. However, Triton warns her that it could be perilous. As chaos ensues in the sea, all the creatures blame the boot for their troubles, and various villains plot to seize it in order to overthrow Triton's rule. Determined to uncover the truth, Ariel ventures to the surface to learn about the true purpose of the mysterious item.