Not having read the first volume of this series is a bit of a disadvantage but explanations are rife during Chapter One. Techjacket is a schoolboy having acquired the Jacket which gives him all sorts of powers. He helps defend the Earth and Geldaria from alien invasion. Zack's relationship with lin develops but an alien called Null is out ot steal his techjacket. Nicely-drawn and conceived, it is a pleasure to read. Plenty of old-fashioned super-hero action: I just hope that they don't drag this series out as much as Invincible.