Ariel and her little sea friends get King Triton gifts for Father's day. She goes to a cave to get a glowing seashell and they get trapped in by an octupus so Urchin uses the triton to beat him but loses it in the process.

Sebastian is sad because he's a little crab, so Ariel goes to a cave where she becomes a sea witch. She puts a spell on Sebastian that makes him big, but the bigger Sebastian gets the less room their is for everyone in the sea.