テラフォーマーズは、未来の火星を舞台に、異常な進化を遂げたゴキブリ「テラフォーマー」と人類の戦いを描いたSFアクション漫画です。物語の始まりは、21世紀に火星のテラフォーミング(居住可能な環境づくり)のため、苔とゴキブリを送り込んだことがきっかけでした。500年後、火星で調査を行うために派遣されたバグズ2号のクルーたちは、人間型に進化したゴキブリに遭遇し、その圧倒的な戦闘力に苦しむことになります。
人類はゴキブリを駆除するため、昆虫や動物の能力を持つ「バグズ手術」を受けた特殊な隊員を送り込む計画を立てました。バグズ2号に乗り込んだ15名のクルーは、この手術を受け、テラフォーマーと戦いますが、予想以上の進化を遂げたテラフォーマーとの戦闘で、多くの仲間が犠牲になります。最終的に、生き残ったのは蛭間一郎と小町小吉の2名だけで、彼らは地球に帰還することになります。
In an attempt to colonize Mars, 21st century scientists are tasked with terraforming the planet. Their goal is to seed the planet with a modified algae to absorb sunlight and purify the atmosphere, and cockroaches, whose corpses spread the algae across the planet as they feed.
Five hundred years later, the first crewed ship to Mars lands and its six crew members are attacked by giant mutated humanoid cockroaches with incredible physical strength, later labeled “Terraformars”; the crew is wiped out after sending a warning back to Earth. Two years later, BUGS II, a multinational expedition of genetically modified humans, is sent to collect 10 samples of both sexes of roaches, and exterminate the mutated bugs to take control of the red planet. Only two survivors manage to return to Earth, one swearing to return and avenge their fallen companions. As a third expedition is assembled questions are raised about the true origin of the Terraformars and their connection with an unknown disease afflicting mankind, the Alien Engine Virus, or A.E. Virus. To fight the Terraformars’ strength and agility, members of the second and third expedition undergo genetic modification to inherit the characteristics of other organisms, only possible after having a special organ implanted with a 36% chance of surviving the surgery itself.
The third expedition ends with most of its crew members killed as well, be it by fighting the Terraformars, or among themselves in the multi-sided conflict between the various factions aboard the ship, each with its own opposing interests. Despite that, the few survivors manage to collect enough samples for the research on a cure to the A.E. Virus and return home. However, a new fight against the Terraformars begins when it is revealed that the creatures arrived on Earth long before. After multiplying at an alarming rate and adapting themselves far better to their new environment than they did on their homeworld, they start their plan to take over the planet.