folk ▁of ▁Atl ant ica ▁present . ▁A riel ▁s ings ▁a ▁l ull aby ▁to ▁baby ▁Mel ody ▁express ing ▁her ▁love ▁and ▁how ▁she ▁hopes ▁Mel ody ’ s ▁heart ▁will ▁always ▁belong ▁to ▁her ▁and ▁the ▁sea ▁because ▁of ▁her ▁mer ma id ▁her itage . ▁A riel ' s ▁father ▁King ▁T rit on ▁presents ▁Mel ody ▁with ▁a ▁magic ▁lo cket ▁with ▁her ▁name ▁on ▁it . ▁The ▁party ▁is ▁interrupted ▁by ▁Urs ula ' s ▁younger ▁sister ▁M org ana , ▁who ▁threat ens ▁to ▁have ▁Mel ody ▁fed ▁to ▁her ▁pet ▁t iger ▁sh ark , ▁Und ert ow , ▁unless ▁T rit on ▁surr enders ▁his ▁tr ident ▁to ▁her . ▁M org ana ▁then ▁announ ces ▁her ▁plan ▁to ▁use ▁the ▁tr ident ▁to ▁a ven ge ▁Urs ula ▁and ▁take ▁over ▁the ▁ocean . ▁A riel ▁and ▁Eric ▁work ▁together ▁to ▁fo il ▁M org ana ' s ▁plan , ▁and ▁T rit on ▁shr inks ▁Und ert ow ▁to ▁the ▁size ▁of ▁a ▁pir anha . ▁M org ana ▁esc apes , ▁el ud ing ▁the ▁attempts ▁of ▁King ▁T rit on ' s ▁forces ▁to ▁capture ▁her ▁and ▁declaring ▁that ▁she ▁will ▁som ed ay ▁exact ▁her ▁reven ge ▁on ▁both ▁A riel ▁and ▁T rit on ▁and ▁a ven ge ▁Urs ula ' s ▁death . ▁ ▁F ear ing ▁M org ana ▁and ▁remember ing ▁Urs ula , ▁A riel ▁dec ides ▁that , ▁until ▁M org ana ▁is