Sabrina travels to Australia's Great Barrier Reef with her best friend Gwen, a fellow witch from England, for a week-long vacation where they try to help protect a hidden mermaid colony whose habitat is threatened by ocean pollution, and by a local marine biologist determined to find the colony as his claim to fame. While Sabrina finds romance with a "merman" from the mermaid colony, Salem the cat finds a possible romance with another witch-turned-into-a-cat, named Hilary, but finds Sabrina's problems interfering with his plans.
Melissa Joan Hart
as Sabrina Spellman
Tara Charendoff-Strong
as Gwen
Scott Michaelson
as Barnaby
Lindsay Sloane
as Fin
Nick Bakay
as Salem Saberhagen (voice)
Peter O'Brien
as Dr. Julian Martin
Rebecca Gibney
as Hilary Hexton, the Cat & Woman
Conrad Coleby
as Jerome Hestor
Steve Harman
as Dr. Martin's Assistant
Ben Lawson
as Waiter
Victor Parascos
as Helicopter Pilot
Enrico Mammarella
as Resort Manager
