Remember the strange person who keeps popping up in the lighthouse? It turns out she is Princess Ariel of Atlantis, and is looking for more people for her home. She has chosen the Twist and Gribble kids to join her. While Pete, Linda, Tiger, Rabbit, Gribbs and Bronson are all initially thrilled to get the chance but learn they can never come back if they go. After Pete realises what he feels for Fiona and the rest of the group realise how much they like Port Niranda they realise they can't go.
Meanwhile, Fay handcuffs herself to Mr. Gribble and then goes into labour!
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Ready to Watch Round The Twist, Season 4, Episode 13?