Best friends Jellyfish and Seahorse live in a rockpool. Jellyfish loves to sing and dance and make a mess! Seahorse wants things to be quiet and tidy. When Jellyfish invites Crab, Starfish and the Shrimps over for an impromptu party, the ruckus upsets Seahorse and he leaves. But soon he feels lonely all by himself in the quiet. After the party guests are gone, Jellyfish realises she has been unkind to her tidy friend and cleans up the mess. When Seahorse returns, they throw a party together ... and everyone cleans up together afterwards.