After a magic show with Daphne volunteered, they head out at Atlantica in South America, but when the Ghost of Merlin returns, he starts to follow Mystery Inc. on a boat with shipments, and he uses a spinning transformation on Daphne, turning her into Ariel the Little Mermaid, and she heads into the sea remaining in the form forever. And now the gang must find a way to restore her to normal.


August 18, 1990 on ABC.


  • Scooby-Doo (Don Messick)
  • Shaggy Rogers (Casey Kasem)
  • Fred Jones (Frank Welker)
  • Daphne Blake/Ariel (Heather North/Jodi Benson)
  • Velma Dinkley (Christina Lange)
  • Merlin's ghost (John Stephenson) - revealed to be the sea captain
  • 38-Year Old Ariel (Jodi Benson)
  • 40-Year Old Eric (Christopher Daniel Barnes)



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