FULL EPISODE SYNOPSIS (spoiler!)

Almost six months have passed since the Robinsons were shipwrecked. David and Elisabeth have decided that seeking rescue with the raft on the vast ocean would be too dangerous. Instead, David has another idea. He wants the family to built a fort on top of a hill to give them a place of refuge should they again come under attack from pirates or natives. When David shows the site to his wife, Ernst and Joanna, Elisabeth spots another native canoe approaching the island.

This time the natives bring their dead King to the burial chamber where he ceremoniously is laid to rest. After that they leave the island again.

The Robinsons start building the fort. Everyone is helping, even Emily, and fairly quickly their work is finished. Elisabeth also discovers flax and hopes to be able to make linen from it.

One day Billy believes to have seen a mermaid in a cove. When Ernst goes to investigate the cove in the morning, secretly followed by Billy and Christina, he discovers a native girl coming out of the ocean and entering the holy cave. Ernst follows her inside. Unnoticed, again the canoe approaches carrying the medicine man and a group of warriors. They take Ernst and the girl prisoner. While Billy keeps watch, Christina runs back to the treehouse to tell her father what has happened. David sends his wife and daughters and Emily up to the fort where they will be safe. He himself goes down to the beach to see if he can possibly rescue his son. He meets with Billy to find out what has happened and then goes down into the cave by the other entrance.

Meanwhile down at the beach the medicine man pours a milky liquid down the girl's throat. He tries the same with Ernst but the boy manages to knock it out of his hands. The girl looses consciousness. The warriors take their prisoners back into the cave. David has hidden himself away inside the sarcophagus. He comes up and shoots at the medicine man hitting him at the shoulder. The warriors flee, taking the medicine man with them. They put him onto the canoe but when they furiously row away he slips from it unnoticed and remains floating unmoving in the water. In time he is washed ashore, weak but alive.

David and Ernst take the girl to the treehouse. The others have returned from the fort after seeing the canoe leave and tend to the girl. When she regains consciousness she tells them her story. Her name is Moya. She is the king's daughter and has learned a little English from him. He has died and the new king, who is an old man, wishes to marry Moya. But she is in love with a young man called Adu and has fled to the Island of the Gods to speak to her father's spirit. It is clear that Moya cannot return to her people. Elisabeth offers her to stay with them. Moya gladly accepts.

Moya settles in quickly. Everyone likes her and she has some influence over the family. Christina is quite fascinated by the deity Moya's people believe in, the Sea God. And since Moya's clothing is much more suitable for the climate than the long dresses the girls have been wearing Elisabeth sews them trousers. Only Emily is envious of Moya's popularity with the others. Moya also brings around her small canoe with a sail on which she has come over to the island. The family plans to use it to go out to the wreck and dive down to salvage some badly needed canon balls and powder.

After he has recovered somewhat from his injury the medicine man begins to watch Moya and the Robinsons. One evening he cuts loose Moya's canoe and lets it float out to sea. That same evening Emily has another argument with the family and runs into the dark woods, followed by Bruno. In the darkness she runs into a swamp hole. Bruno starts barking. He is heard at the treehouse and David, Ernst, Joanna and Moya come to Emily's rescue. The medicine man watches them, but they do not see him.

The next day they discover that Moya's canoe is gone. She suggests to build a new and bigger one. Later, when Billy returns from fishing with a shell Moya is shocked as she recognises the Devil Shell that is known to her people as being dangerous. Elisabeth asks Billy to throw it back into the sea which he does.

In the days that follow they build a raft and Moya teaches everyone, except Elisabeth and Emily, how to swim and dive properly. Ernst is beginning to be infatuated with Moya.

One evening Moya suddenly suffers from an attack of excruciating headache that passes after a few minutes like it had never happened. What she does not know is that it has been caused by the medicine man.

The next morning David, Joanna, Moya and Ernst take the raft out to where the wreck of the Fury has sunk. Moya dives down to see if it is possible to salvage something from the depth. While she is diving another enchantment of the medicine man again causes her a terrible headache. When she surfaces again she warns the family off. She says it is too dangerous down there and not much left of the wreck.

When she catches Moya alone Emily apologises to her for being jealous. Moya tells her she views her as a friend. Once again the medicine man has been watching hidden in the bushes. This time he plans to kill Moya. He aims a poisonous dart at her but Emily gets in the way and is hit by it.Moya carries Emily back to the ttreehouse. The native princess and Ernst once more go out to sea where Moya dives for a Devil Shell. She is certain that the poison has come from it and knows that the antidote can also be extracted from the shell. She has found a shell and starts back to the surface when yet another enchantment of the medicine man attacks her. She nearly drowns but Ernst manages to pull Moya up unto the raft and revive her. They return to the treehouse and prepare the antidote.

David and Ernst start looking for the medicine man when they spot another canoe approaching the island. They warn the others and retreat to the fort. Suddenly realise that Christina is not with them. David goes back down to the treehouse. He comes just in time to see his youngest daughter being rescued from the evil medicine man by a handsome young native warrior. He demands for Moya. It is Adu, Moya's loved one and, as it turns out, the new king.

Moya says her good-byes to the family and leaves with Adu to her new life as queen of her people.

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