Triplanetary

The first installment in the groundbreaking Lensman series, one of the greatest space opera sagas of all time

Nevia, located many light years from the Earth's sun, is running out of iron, the primary source of energy for the planet's dominant amphibious race. Armed with technology that can extract iron atoms from anything it encounters—rock, machinery, man-made structures, even human blood—the Nevians set their sights on a rich lode of the precious element: the planet Earth. Descending on i...