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Betrayed by his own men, Captain Grahad Mills, a commander of the SAA Special Force "Jackal," is held responsible for a conspiracy about which he knew nothing. Without defense counsel at his court, he is sentenced to death. On the morning of his execution, he escapes the military detention center; in the process blasting a troop of national military guards and killing its commander - Captain Waldman, his former subordinate and betrayer. All this is for revenge and to find out the reason for the treachery. The former hero - feared and known as "Genocide" - starts to fight a battle he created by himself.
The adventurous and kind-hearted Van is a 17-year-old boy who lives in a small village on Planet Zi – a world where giant beast-like mecha known as Zoids live alongside humans. One day, while out on his hoverboard, Van is chased by a group of bandits, and ultimately finds himself in the midst of some old ruins. To his surprise, he finds a hidden passage that leads him to pods containing a wild Zoid (which he names Zeke), and an amnesiac girl named Fiona. To protect his new friends from the bandits that lurk around each corner and to help Fiona regain her memory, Van decides to travel alongside them; and thus their adventures begin!
The year is 1973 when the BETA, a race of aliens discovered on the moon, first arrive on Earth and begin their systematic extermination of the human race. Mankind's only hope lies with Tactical Surface Fighters, or TSFs, piloted by both military elite and would-be trainees such as Yui Takamura, a young girl descended from a long line of Imperial Guards. Alongside other amateurs, she finds herself on the front lines of a final defense against the bloodthirsty monsters, unaware of the brutal consequence that awaits them. Three years later, Yuuya Bridges, a half-Japanese, half-American pilot, is assigned to an elite United Nations squadron tasked with developing new TSFs to beat back the alien forces. As humanity struggles to survive, Yuuya must come to terms with his biases in dealing with both his teammates' and other culture’s tactical fighters, including the veteran pilot Yui Takamura herself.
K—an agile mech pilot in Neo Seoul police's high-speed mobile unit—specializes in chasing down and eradicating terrorists. His duty has always been to protect the citizens, and he's given little thought to the mega-corporations that run the city. But when an ordinary arrest explodes into a nightmarish battle, K is painfully forced to question his convictions. Stripped of all sense of right and wrong, K must make a terrible choice—either join his enemies, or lose all sense of justice!