The five shipwrecked children explore the island where they have been stranded. While sleeping, they are kidnapped by three bearded men: the evil Prime Minister and his two assistents: Quig and Quell. A man, Jeremiah Quizzel, tells them they are on the island 'Tambu' , which is ruled by 'he-who-lives-forever': The "Q" (all last names on the island start with a q). While the Prime Minister is planning on killing the children, a girl rescues them from their cell.
The children meet Helen officially, who takes them to where their boat has been wrecked. They learn about the island from Helen, who tells them that the leader - Q - is over 200 years old.
The children come up with a plan to liberate Jason, Helen's brother, who's been imprisoned for failing to pay his taxes. The children also hear some worrying news on their ship's radio, when they hear the search party to find them has been called off.
Jeremiah decides to follow Aaron as he heads to find Jason. A lonely hermit comes across Aaron as he continues to search for Jason, and questions whether he is Adam Quinn.
In order to keep up the food supply, Anna, Mark, Jason, Su Ying and David go fishing. What they don't know is that there is a bad storm heading right for the island - but no one will believe Tony and Jeremiah.
Jason tells David and Mark that the old hermit attacked him. When they meet up with the hermit though, he tells a slightly different story. Aaron has been missing too much school as the headmaster goes to see his mother.
Mark has been captured and his being held prisioner. Meanwhile Su Ying makes an invaluable friend when she rescues a man from a swamp.
Greta the goat causes a big problem when she eats a treasure map which Tony and Anna took ages to steal from Q.
The children are told that the search party was called off because they were presumed dead, by a pilot who crashes his plane on the island - and he may not make it as he is badly injured.
Quig and Quell are causing problems for the children so they decide to get them back by using the walkie talkies.
Mark is lured by Aaron into the dense forest, catching on that maybe Aaron isn't trying to help them. Meanwhile, David continues to plan the children's escape.
The headmaster again is chasing up Aaron because of the amount of school he is missing. Jeremiah comes up with a plan with Tony to teach agriculture to an old widow who may be able to help them.
People on the island are becoming sick and the children want to help. Thomas steals a book, but because it is in Latin the children are unable to read it.
Q finally captures David and tries to convince David to help them - but he isn't sure whether to trust Q. In order to keep safe, David spins a story, and hopes that Q will fall for it.
Tony meets a girl called Bess who appears to be able to do anything she wants, whenever she wants. What Tony doesn't realise is that Q is in charge of taking care of her and she has a plan for Tony.
Christian Dobler, a teacher, arrives on the island after the winds took him off course. He is found by the children, who shelter him from Q, but then Christian disappears.
Anna and Christian are caught, after the children find out that Christian only left because he hadn't hidden his boat properly. But will Christian stay to help the children if they manage to free them?
David makes Aaron a skateboard and they soon become the most popular thing to do - until the Prime Minister is injured while skating.
Helen warns the children that the volcano will errupt soon as it does every year. They stay away, until they hear that the Prime Minister gets himself trapped on the mountain.
A horse race is conducted by Q in order to decide who gets the horse - the Prime Minister or Aaron who is about to turn 10.
The Prime MInister is at it again with his demands and now wants David to help him become a bird. David creates a glider, but things go wrong when the wind sends the Prime Minister crashing into the ocean.
The children's hiding spot in the forbidden swamp is discovered by the hermit they met while passing through his cave under the volcano to get to the other side of the Island when Aaron ran off to find Jason in episode 4. Very sick, the children nurse him until he feels strong enough to go. Then the hermit is caught by the Prime Minister - who demands the hermit takes him to them.
Helen has to take a very sick David to a Wizard in order to get better and the children try to think of a way to say thankyou.
The Prime Minister still has his eye on the horse he lost in the race to Aaron. So when Q leaves for a while, he sees his opportunity to get the horse.
The children invent a monster in order to frighten Q and the Prime Minister - but will they be discovered?
The Prime Minister arrests a family who he believes know the whereabouts of the children. The children decide it is time for the people to stand up against the Prime Minister and have a new one elected.
