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.
as Sabrina Spellman
as Gwen
as Barnaby
as Fin
as Salem Saberhagen (voice)
as Dr. Julian Martin
as Hilary Hexton, the Cat & Woman
as Jerome Hestor
as Dr. Martin's Assistant
as Waiter
as Helicopter Pilot
as Resort Manager
as Barbara
as Wally Gilliams, TV Newscaster
as Maitre D'
as Sea Wasp Crewman
as Bartender
