Crossover


Joel Shepherd - 2001
    Cassandra is an experimental design — more intelligent, more creative, and far more dangerous than any that have preceded her. But with her intellect come questions, and a moral awakening. She deserts the League and heads incognito into the space of her former enemy, the Federation, in search of a new life. Her chosen world is Callay, and its enormous, decadent capital metropolis of Tanusha, where the concerns of the war are literally and figuratively so many light years away. But the war between the League and the Federation was ideological as much as political, with much of that ideological dispute regarding the very existence of artificial sentience and the rules that govern its creation. Cassandra discovers that even in Tanusha, the powerful entities of this bloody conflict have wound their tentacles. Many in the League and the Federation have cause to want her dead, and Cassandra’s history, inevitably, catches up with her. Cassandra finds herself at the mercy of a society whose values preclude her own right even to exist. But her presence in Tanusha reveals other fault lines, and when Federal agents attempt to assassinate the Callayan president, she finds herself thrust into the service of her former enemies, using her lethal skills to attempt to protect her former enemies from forces beyond their ability to control. As she struggles for her place and survival in a new world, Cassandra must forge new friendships with old enemies, while attempting to confront the most disturbing and deadly realities of her own existence

Fear the Sky


Stephen Moss - 2014
    Years before they enter orbit, their approach will be announced by the flare of a thousand flames in the sky, their ships’ huge engines burning hard to slow them from the vast speeds needed to cross interstellar space. These foreboding lights will shine in our night sky like new stars, getting ever brighter until they outshine even the sun, casting ominous shadows and banishing the night until they suddenly blink out. Their technology is vastly superior to ours, and they know they cannot possibly lose the coming conflict. But they, like us, have found no answer to the destructive force of the atom, and they have no intention of facing the onslaught of our primitive nuclear arsenal, or the devastation it would wreak on the planet they crave. So they have flung out an advanced party in front of them, hidden within one of the countless asteroids randomly roaming the void. They do not want us, they want our planet. Their Agents are arriving.

Crystal Soldier


Sharon Lee - 2005
    Believing that they had won, the citizens of the galaxy rebuilt. The Inner Worlds, which had escaped the worst of the war's ravages, became even more insular, while the Rim worlds adopted a free and easy way with law and order. Now, hundreds of years after their withdrawal, the Enemy is back - and this time they'll be satisfied with nothing less than the extinction of the galaxy.

Consider Phlebas


Iain M. Banks - 1987
    Billions had died, billions more were doomed. Moons, planets, the very stars themselves, faced destruction, cold-blooded, brutal, and worse, random. The Idirans fought for their Faith; the Culture for its moral right to exist. Principles were at stake. There could be no surrender.Within the cosmic conflict, an individual crusade. Deep within a fabled labyrinth on a barren world, a Planet of the Dead proscribed to mortals, lay a fugitive Mind. Both the Culture and the Idirans sought it. It was the fate of Horza, the Changer, and his motley crew of unpredictable mercenaries, human and machine, actually to find it, and with it their own destruction.

Empire


Michael R. Hicks - 2009
    Nightmarish female warriors with blue skin, fangs, and razor sharp talons, the Kreelans have technology that is millennia beyond that of the Confederation, yet they seek out close combat with sword and claw, fighting and dying to honor their god-like Empress. Captured and enslaved, Reza must live like his enemies in a grand experiment to see if humans have souls, and if one may be the key to unlocking an ages old curse upon the Kreelan race. Enduring the brutal conditions of Kreelan life, Reza and a young warrior named Esah-Zhurah find themselves bound together by fate and a prophecy foretold millennia before they were born.

Starship Troopers


Robert A. Heinlein - 1959
    We just call it “The Bug War." Everything up to then and still later were "incidents," "patrols," or "police actions." However, you are just as dead if you buy the farm in an "incident" as you are if you buy it in a declared war...In one of Robert A. Heinlein’s most controversial bestsellers, a recruit of the future goes through the toughest boot camp in the Universe—and into battle with the Terran Mobile Infantry against mankind’s most alarming enemy.

To Honor You Call Us


H. Paul Honsinger - 2012
    In 2315, the wily Max Robichaux is given command of the USS Cumberland, a destroyer with state-of-the-art capabilities but a combat record so bad, she’s known as the “Cumberland Gap.”Capt. Robichaux’s first mission: to take his warship to the Free Corridor, where the Krag have secretly been buying strategic materials, and to seize or destroy any ships carrying enemy cargo. Far from the fleet and under enforced radio silence, Max relies only on his determination and guile…and the support and friendship of his chief medical officer, the brilliant Dr. Sahin.Because even as he deals with the ship’s onboard problems and the stress of carrying out her risky assignment, Max and the doctor discover that the Cumberland and her misfit crew are all that stands in the way of a deadly Krag attack that threatens to end the war—and humanity—once and for all.A far-future story in the tradition of “ships of wood, men of iron” novels, To Honor You Call Us and the Man of War series combines the adventure of exploration, the excitement of war, and the dangers of the unknown through the eyes of a ship and her crew.

War Dogs


Greg Bear - 2014
    Maybe my last.They made their presence on Earth known thirteen years ago.Providing technology and scientific insights far beyond what mankind was capable of. They became indispensable advisors and promised even more gifts that we just couldn't pass up. We called them Gurus.It took them a while to drop the other shoe. You can see why, looking back.It was a very big shoe, completely slathered in crap.They had been hounded by mortal enemies from sun to sun, planet to planet, and were now stretched thin -- and they needed our help.And so our first bill came due. Skyrines like me were volunteered to pay the price. As always.These enemies were already inside our solar system and were moving to establish a beachhead, but not on Earth.On Mars.

Martian Time-Slip


Philip K. Dick - 1964
    For although the UN has slated "anomalous" children for deportation and destruction, other people—especially Supreme Goodmember Arnie Kott of the Water Worker's union—suspect that Manfred's disorder may be a window into the future. In Martian Time-Slip Philip K. Dick uses power politics and extraterrestrial real estate scams, adultery, and murder to penetrate the mysteries of being and time.

Warp Speed


Travis S. Taylor - 2004
    Neal Anson Clemons, brilliant physicist and martial arts expert, was born at the very moment that men first landed on the moon, and his dream had always been to find a way to travel to the stars. And now he and his team have achieved a breakthrough, both in building a warp drive, and finding a new energy source powerful enough to make the drive more than an interesting theoretical concept. With the help of a beautiful Air Force Major and astronaut, Tabitha Ames, the US Government has funded the project, including assembly in orbit of the first faster-than-light probe. Unfortunately, forces working behind the scenes have much darker dreams, and they do not hesitate to blow up a space shuttle, attempt to kill Neal and Tabitha, and use the stolen warp technology to start what they expect to be a short victorious war with the United States. But Neal has ideas for using warp drive completely unsuspected by America's enemies, and repelling the all-out attack is only the beginning of a titanic struggle to reach the stars.

Armada


Ernest Cline - 2015
    Dreaming that the real world could be a little more like the countless science-fiction books, movies, and videogames he’s spent his life consuming. Dreaming that one day, some fantastic, world-altering event will shatter the monotony of his humdrum existence and whisk him off on some grand space-faring adventure. But hey, there’s nothing wrong with a little escapism, right? After all, Zack tells himself, he knows the difference between fantasy and reality. He knows that here in the real world, aimless teenage gamers with anger issues don’t get chosen to save the universe. And then he sees the flying saucer. Even stranger, the alien ship he’s staring at is straight out of the videogame he plays every night, a hugely popular online flight simulator called Armada—in which gamers just happen to be protecting the earth from alien invaders. No, Zack hasn’t lost his mind. As impossible as it seems, what he’s seeing is all too real. And his skills—as well as those of millions of gamers across the world—are going to be needed to save the earth from what’s about to befall it. It’s Zack’s chance, at last, to play the hero. But even through the terror and exhilaration, he can’t help thinking back to all those science-fiction stories he grew up with, and wondering: Doesn’t something about this scenario seem a little…familiar? At once gleefully embracing and brilliantly subverting science-fiction conventions as only Ernest Cline could, Armada is a rollicking, surprising thriller, a classic coming of age adventure, and an alien invasion tale like nothing you’ve ever read before—one whose every page is infused with the pop-culture savvy that has helped make Ready Player One a phenomenon.

Phule's Company


Robert Lynn Asprin - 1990
    than most people do all day. Threatened by an alien enemy, Earth's military sends Phule and his soldiers to a distant planet. But now, the aliens have chosen a new target of war . . . Phule's Company.

A Talent for War


Jack McDevitt - 1989
    But now, one man believes Sim was a fraud, and Alex must follow the legend into the heart of the alien galaxy to confront a truth far stranger than any fiction.

Saturn's Children


Charles Stross - 2008
    Freya Nakamichi 47 is a femmebot, one of the last of her kind still functioning. With no humans left to pay for the pleasures she provides, she agrees to transport a mysterious package from Mercury to Mars. Unfortunately for Freya, she has just made herself a moving target for some very powerful, very determined humanoids who will stop at nothing to possess the contents of the package.

Triplanetary


E.E. "Doc" Smith - 1948
    The Arisians, using advanced mental technology, have foreseen the invasion of their galaxy by the corrupt and evil Eddorians, so they begin a breeding program on every planet in their universe. Their goal...to produce super warriors who can hold off the invading Eddorians.