it can be made hospitable by extensive terra-forming. Meanwhile, on Earth, scientists study the fake meteor fragments that landed on Earth and found out their real content. They were able to conclude that an intelligent alien species were conducting a study of the Earth and were anxious of the intentions of the aliens. The nine major scientific research centers around the world, named N1 to N9, were informed of the situation and the political, military, and scientific leaders of Earth were summoned to N1 – the headquarters of all the research centers to discuss the next steps. One of these scientist is named Dr. Cromwell Colins – head of the oceanographic research center affiliated with N1. Because of their spying capabilities, Gotham was made aware of this event and General Gulf decided to launch a preemptive attack on Earth in order to take advantage of the situation where all world leaders are vulnerable in one place. Gotham's space ships destroyed the Earth's extraterrestrial research facilities and attacked Earth – destroying much of the civilization on Earth including research centers N2 to N8. Only research center N1 and N9 was able to escape destruction. Dr Colins was one of those killed by the attack. Before he died, he gave his son – Colin Collins – a pendant and asked him to remember the word "Thundersub". He then asked Colin to proceed to research center N1 since the hope of humanity is in there. Colin and his high school classmates then met a mysterious young lady named Anna who cannot talk because she was in a state of shock during a brief stopover on one of Colin's classmates home. Colin and team then boarded a flying craft and decided to proceed to N1 to fulfill his father's wishes. Terror Star move to stay in orbit of the planet Earth. Because of the tidal forces brought about by the new satellite, the Earth's axis was shifted and geological and environmental disasters like tornadoes, earthquakes, and volcanic eruptions occurred. Ninety percent of the Earth's population were wiped out in less than a day. The few remaining survivors of the human race escaped to the mountains. Within days, the Gothamite occupation has built a series of sea fortresses around the world that converts sea water to heavy water – the aliens main source of energy. Meanwhile, Colin and his other classmates arrived at research center