You play as Roy Becket, a young pilot with dreams of becoming as skilled as his adoptive father. When a galactic war against an ancient mechanical alien race reaches its boiling point, Roy is forced to spring into action and take control of an otherworldly bipedal war machine in hopes of saving what's left of humanity.

Joining Roy is a young girl who claims to have escaped the clutches of the nefarious aliens. Forever altered through the horrible experiments to which she was subjected, she now possesses the very abilities humanity will need to push back the Doomsday Clock.

Together, the pair must face an unrelenting army alone and reunite their shattered families.

The end of civilization as we know it is on the horizon. Between humanity and eradication stands Astebreed.