Aliens scatter pods across the surface of the Earth, which sprout metallic tentacles that transform every living creature into a killing machine. So far a girl named Miranda has been the only one to escape. Her body was transformed into steel weapon, but she has retained her basic human instincts. Guide her though diverse levels as she vows to defeat the aliens and save the world. If Miranda is running low on strength, she can eat a slain alien to regain it. Help Miranda save the planet in STEEL HARBINGER.