The Little Mermaid (1992)

S01E07 Message in a Bottle

Title: Bottle of Secrets Plot: In his solitude, a dragon crafts a heartfelt note and places it in a bottle. Ariel discovers the message and decides to meet the dragon. He agrees to visit her home, but King Triton forbids it unless the dragon first helps them fend off a group of malevolent sea creatures threatening their realm.