Mysterious Island

Harding carries out his part of the deal with Nemo, and the other castaways are enraged, moving from the Granite House into a makeshift hut on the beach, and prompting Nemo to announce his experiment is complete.

Nemo reveals to Harding that his need to complete his experiment is greater than his desire to help the castaways off the island, and Harding is forced to cut a deal.

A series of accidents leads Harding to come face to face with the mysterious phantom, and he struggles with how to share the shocking truth.

Joanna argues with Herbert after a dream about a baby, and leaves the Granite House, headed for Ayrton's cabin. She has an accident on the way there, and is rescued by Nemo, who drugs her and questions her, learning she is pregnant with Jack's baby, but is afraid of childbirth.

Herbert realizes that it is his birthday, but decides to keep it a secret. He is angry because he thinks Joanna has forgotten, and while she prepares a surprise gift for him, he decides to find a way to leave the island.

Nemo fulfills a promise to Katira to bring the rest of her people to the island, then watches with glee as the natives take over Granite House and send the castaways into exile.

Nemo observes Harding's feelings about Joanna, manifested in romantic dreams, as part of his research into the workings of the human mind. Meanwhile, Joanna is trapped by an earthquake while Herbert discovers a cryptic note from Ayrton.

Harding dives into Nemo's lair beneath the lake and is trapped in a chamber. Gideon is awakened by an intruder.

Pirate Captain Cutler and three of his crew come to the island to collect their buried treasure and seek revenge on Ayrton, whose dark past is revealed.

Jack leaps into the water to rescue his son from the unseen menace and they swim to the safety of the shore where Gideon has found a bottle. Back at Granite House a message is pulled from the bottle‹written by a fellow castaway on the island! Jack, Herbert and Gideon set out on a test voyage in their boat to locate the castaway. They find his well-stocked camp and gather up supplies as no one is in sight. Mr Ayrton soon makes an appearance and Herbert convinces his father to take him back with them. Meanwhile, Joanne, while out by herself gathering plants, is overcome by Nemo's gas devise and falls unconscous. When Neb goes to search for her, he too is overcome but before he collapses, he sees Nemo approach. Back in Nemo's lair, Nemo posions Neb, making it appear to be from a snake bit. Harding later finds Neb's body and a memorial service is held, with Harding biding a tearful farewell to his dear friend.

Following an earthquake, the group decides to seek shelter further inland. When a landslide strikes, Gideon becomes trapped beneath some large boulders. Harding and Neb set out to find materials to make an explosive change but Neb is overcome by sulfur fumes and must be pulled to safely by Harding. The final item on Cyrus's list turns up out of thin air (Nemo) allowing him to formulate an explosive to free Gideon. Traveling on, Neb falls down into a cave complex which becomes the group's new home, christened "Granite House" by Gideon. While fishing, Neb and Herbert pull an old sea chest out of the ocean. Returning to camp for asistance, Neb is hit by the effects of eating wild berries and loses his sight while atop a dangerous precipice and loses his footing…

The Battle of Richmond, March 20, 1865: Captured by Confederate forces, the group escapes their captors and flees in a helium balloon. Rising into the sky, the travelers and their balloon are carried away by strong winds and soon find themselves over open water. Attempting to land, the balloon descends uncontrollably (helped along by Nemo observing from an island below) forcing the group to climb into the rigging and drop the backet to remain aloft in hopes of reaching the island before they plunge into the ocean. Struggling to stay in the air, Captain Harding sacrafices himself to the ocean, allowing the balloon to slow its descent and reach the island. Exploring the island for signs of civilization with Neb, Herbert becomes trapped in a rock pool as the tide comes, threatening to drown him. Neb manages to rescue Herbert (with unseen help from Nemo). Herbery and Neb enter into a cave where they encounter signs of habitation.