A fierce storm shipwrecks the Robinsons on an island, abandoned by the crew. While exploring their new home Fred and Ernie find a deserted hut which puts them in peril as it a spiritual place for the natives.
Jeremiah's pet hawk returns but elation soon turns to concern. The raptor's focus is on the livestock of the Robinson's especially Helga's pet goat. A difficult decision must be made by Jeremiah.
Two escaped British prisoners capture Lotte and Helga, holding them hostage. Karl and his sons must find a way to rescue them without anyone getting injured.
Ernie goes missing and the rest of the castaways fan out in a search for him. Mother Lotte finds a cave and while looking there is trapped in a landslide. The rest of the group are frantic to free her.
The Robinsons are again trouble with the natives as the children find an idol and keep it. Karl must lead a rescue after Helga and Ernie are taken captive in retribution for the missing religious figure.
While exploring a rugged part of the island Jeremiah come down witn a life threatening illness. The Robinsons fight to keep their friend alive while getting back to their camp.
A unknown creature seems to live in the jungle just beyond the Robinson's clearing. It's hostility keep the shipwrecked people from venturing very far. Karl Robinson realizes action must be taken.
After the Robinsons rescue a man they learn that he killed the captain of his ship. Their hopes of rescue are put in doubt when they learn of the circumstances of the incident.
Karl is bitten by what was thought to be a friendly chimp and his life is threatened by a subsequent illness. The rest of the Robinsons, Helga, and Jeremiah worry about their existence without the leadership of Karl.
The Robinsons are excited when they encounter a recently shipwrecked Captain Anaheim. They hope he can help them get off the island but realize to late that the loss of his ship has made the Captain deranged.
Karl and Lotte try to create a typical Switzerland Christmas for everyone, which is difficult on a tropical island. But the shipwrecked travelers have their celebrations interrupted and their lives put in danger.
The Robinson's come across a sailor who claims to have been shipwrecked. But the family find they are harboring a man who killed the ship's captain and see their dream of returning to civilization endangered.
The Robinsons, Helga, and Jeremiah uncover a hidden treasure, which leads them to imagine a great life after being rescued. But someone else wants the riches with Jeremiah endangering all when he won't relinquish his share.
A pack of wild dogs appear near the Robinson's camp and begin terrorizing the castaways. As the group tries to decide on a strategy they begin to think the alpha animal was once a tame pet.
Karl and Fred take a canoe to explore a nearby island in hopes of rescue. The two Robinsons stumble into a dangerous dispute between a band of brigands and natives.
The Robinsons find a huge bell while on their exploration of the island. When a series of violent earthquakes strike, the group must find a way to survive amidst the disaster.
The infamous Jean Lafitte and his fellow pirates appear on Robinson's island. At first fearful, Karl and Lotre begin to hope their rescue is imminent when LaFitte returns to civilization.
As Jean Lafitte and his pirate band prepare to leave the Robinsons hope that it will lead to their rescue. Instead the criminals kidnap Jeremiah and his friends must figure out how to rescue Jeremiah.
Fred needs lifesaving surgery and Karl realizes he will have to perform it. Karl believes the sunken ship has some of the implements he needs so the dad will have to dive for them before operating.
A mysterious jungle inhabitant threatens the Robinson's well being. A series of unfortunate happenings occur that seem to be related to the dark forces released by the man. Karl believes there is a logical explanation to everything.
