After humanity’s first manned mission to the Red Planet was lost, a second expedition arrives. The explorers prepare to exterminate the cockroaches that were used to transform the Martian environment, but are shocked to discover that the insects have mutated into giant, aggressive humanoids with one overriding goal—exterminate the humans! However, this crew of explorers has each undergone the “Bugs Procedure,” terrifying experimental surgery designed to make them more than human…
 
(Source: Viz Media)

During the 21st century, humanity attempted to colonize Mars by sending two species which could endure the harsh environment of the planet to terraform it—algae and cockroaches. However, they did not anticipate the species' remarkable ability to adapt. Now in the 26th century, a lethal disease known as the Alien Engine Virus has arrived on Earth, and the cure is suspected to be found only on Mars. The problem is, Mars in the present is overrun by creatures known as "Terraformars," incredibly powerful and intelligent humanoid cockroaches that mutated from those originally sent to the planet. 

The Annex I team, consisting of a hundred men and women genetically enhanced with characteristics of powerful organisms from earth, has been sent to Mars on a mission to find the cause of the Alien Engine Virus and to help cure humanity—signalling the start of the crew's fight for survival.

Adaptation of the Bugs 2 arc of the manga. 
 
In the late 26th century, overpopulation on Earth is reaching the breaking point, and humanity must find new frontiers. The terraforming of Mars has taken centuries but is now complete. The colonization of Mars by humanity is an epoch-making event, but an unintended side effect of the terraforming process unleashes a horror no one could ever have imagined. 
 

After humanity's first manned mission to the Red Planet was lost, a second expedition arrives. The explorers prepare to exterminate the cockroaches that were used to transform the Martian environment. They are shocked to discover that the insects have mutated into giant, aggressive humanoids with one overriding goal — exterminate the humans! But this crew of explorers has each undergone the Bugs Procedure, terrifying experimental surgery designed to make them more than human...
 
(Source: Viz Media)

The second season of Terra Formars. 
 
In Terra Formars Revenge, the crew members of the Annex I continue to fight against Terraformars—the large humanoid cockroaches that evolved from the ones sent to Mars centuries ago. However, far from discovering the cure for the lethal Alien Engine Virus that has been plaguing Earth, the Annex I team have learned that some squadrons have agendas from their own countries. Now, the squadrons must not only fight against the Terraformars for their survival, but also each other in the never-ending battle for international dominance.

Adaptation of the Earth arc events happening in volume 21 and 22 of the manga.

The manga focuses on the character Sylvester Asimov before departing for Mars, and tells a story not told in the main manga. The magazine teases, "before he departs for Mars, the mission he's entrusted with is...."

 
(Source: Anime News Network)

A Terra Formars side story about the German team officer Adolf Reinhard.

You will know the man, the boxer, Keiji Onizuka.
Before Annex 1 sets out for Mars, Keiji is stationed in U-NASA's branch office in Japan undergoing training. What unknown incident will he be pulled into?

 
(Source: Anime News Network)

The story is set between the Bugs 2 and Annex I missions, in the jungles of Latin America where Bugs Procedure experiments were done.

A slapstick comedy, which re-imagines Michelle and Komachi as a police officers. br>
(Source: MAL)

Terra Formars 1 tells the story of the BUGS1 mission to Mars in 2577.

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