When Captain Ryker Vaughn signed up for ordnance patrol, he knew that scavenging for improvised explosive devices carried risk. After unexpected and inexplicable dangers, he becomes the sole survivor of his team - and a double amputee. Cinching tourniquets on his traumatically amputated legs, he fends off enemies before losing consciousness. After waking up post-surgery, Ryker finds prosthetic metal posts protruding through the skin of his residual limbs. The posts connect to state-of-the-art bionics called Ozzies, which could change his life by restoring his ability to walk, stronger and faster than ever. Yet despite receiving this life-altering technology, he vows to never walk again, believing that being mobile would dishonor his now deceased team. But when an unparalleled force enters Earth's atmosphere, threatens to extract the planet's most valuable resource, and abducts his little brother, Ryker must make a stay under the covers, or use his innovative bionics and return to duty.