Dora the Explorer (2000)

S4E23 Dora Saves the Mermaids

Dora and Boots embark on a mission to assist Mariana the mermaid in retrieving her magical crown, which has the power to restore cleanliness to the Mermaid Kingdom. Their journey is urgent as they work to thwart a wicked octopus who is polluting the waters with trash. Together, they navigate challenges and rally friends to ensure the ocean is safe and beautiful once more.