Colin and his surviving classmates make it to the N-1 island where they find the mysterious Thundersub.
After launching the Thundersub, the thunder-team find a downed Cuban fighter pilot then launch their first attack on the Gotham.
While heading for Bermuda, Captain Noah and the thunder team discover the death force have enslaved the remaining human survivors of the Gotham invasion and they plan a rescue mission.
Colin and Domingo break into the death force base to rescue the enslaved human survivors.
Colin and Capilla escape from the island with their lives before being rescued by the Tempest Junior.
Kapilla and Tara try to appeal to Captain Noah to return them to Gypsy Atol.
While on their way to the Gilbert islands, the Thunder team discover the death force has constructed an elevator that can reach as high as the terror star.
Captain Noah and the Thundersub team devise a plan to attack the Deathforces orbital elevator.
The Thundersub returns to the gypsy atoll island to aid Kapila and Tara after receiving an S.O.S from them.
In an attempt to make repairs to the Thundersub after the attack on the death force orbit elevator, Captain Noah and the thunder team change course to Antarctica.
After arriving at Antarctica, the Thunder team take refuge inside an iceberg for much needed recovery.
The Thundersub crew becomes stricken with food poisoning caused by a red tide. deployed by the death force and Anna and Sarah both try to find the antidote.
The Thundersub gets entangled in an anti submarine Net set up by the death force but Anna comes up with an escape plan to get the Thundersub out.
Colin assumes command of the Tempest Jr after Skipper Grogen sacrifices himself to save tempest team from incoming Danger.