Books like 'Condition Zero'
Readers who enjoyed Condition Zero by Donald B. McFarlane & Luke West also liked the following books featuring the same tropes, story themes, relationship dynamics and character types.
hard sci-fi action / adventure military, war & conflict soldiers exploration space-travel dystopia military aliens invasion
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A Grimm Sacrifice by Jeffery H. Haskell
Rated: 4.50 of 5 stars · 14 ratingsIn order to survive, Interceptor must change the rules.The Consortium is in real trouble. Caliphate Naval forces have stepped up their raids on the border planets and are taking people by the thousands. They can defend the wormhole, or they can defend their planets, not both...Categorized as:
space-opera military aliens invasion space-travel galactic-empire soldiers first-contact -
![The Human Factor by Joshua Dalzelle]()
The Human Factor by Joshua Dalzelle
Rated: 4.49 of 5 stars · 26 ratingsCaptain Jason Burke is a man apart, and not just because he's the only of his kind for thousands of lightyears in any direction. The changes to his body and to his genetic code have made him faster, stronger, more able to survive in his dangerous occupation ... but they've also ensured that he'll never truly fit in with others of his species...Categorized as:
aliens first-contact galactic-empire military soldiers space-fleet space-opera action-adventure -
![Messinants by S.H. Jucha]()
Messinants by S.H. Jucha
Rated: 4.50 of 5 stars · 10 ratingsPyre is a volatile planet. Its surface belches heat and noxious gases, forcing downsiders to inhabit domes. But Pyre’s instability isn’t limited to its geology. The colonists, who were marooned in the system hundreds of years ago, have endured a tumultuous history.Exploring Triton, Pyre’s third moon, spacers inadvertently activate an alien dome...Categorized as:
aliens exploration first-contact invasion space-opera space-travel action-adventure adult -
![Secrets in the Stars by Mackey Chandler]()
Secrets in the Stars by Mackey Chandler
Rated: 4.50 of 5 stars · 10 ratingsWhen Lee Anderson and her parents discovered a new world teeming with life, it was the dream of every explorer: they were rich beyond their imaginations. But tragedy struck when a herd of creatures overran their camp and killed her parents. The only other adult in her life had been their partner Gordon, who adopted her as parent. Which didn’t turn out to be easy, because he wasn’t human... -
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![That Which Other Men Cannot Do by Ryk Brown]()
That Which Other Men Cannot Do by Ryk Brown
Rated: 4.44 of 5 stars · 26 ratingsEpisode 15 New forces grow… Old friends are lost… New alliances are forged… Old weapons are made new… With political unrest growing, the Alliance must rush to rebuild their fleet and expand their 'sphere of influence' before their support runs out. But when the Jung up the ante, the Alliance must turn up the heat...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Edge World by B.V. Larson]()
Edge World by B.V. Larson
Rated: 4.48 of 5 stars · 23 ratingsA lonely planet circles a star on the very border of Province 921. Critical resources produced there are claimed by both the Mogwa and the Skay. War between the Galactic giants becomes more likely every day.James McGill and Legion Varus are deployed to protect Edge World, a planet that rotates at a walking pace. Each day is as long as a year back on Earth...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Rescue The Princess by John Hindmarsh]()
Rescue The Princess by John Hindmarsh
Rated: 4.42 of 5 stars · 12 ratingsJack suffered from an attack by the Blue Caps. He sued the RSN and won. He also sued the Royal Family and won. Now he’s acquired his own warship and his first mission is to rescue the princess.What? Yes, Sofia is missing. The Queen has taken an intense dislike to her daughter’s ambitions and Sofia has disappeared. Jack sets out to rescue her with the assistance of Black Company marines...Categorized as:
galactic-empire military soldiers space-fleet space-opera space-travel action-adventure adult -
![Odysseus Ascendant by Evan Currie]()
Odysseus Ascendant by Evan Currie
Rated: 4.41 of 5 stars · 27 ratingsA mysterious entity may be the key to a starship’s survival—or a terrifying new threat—as the Odyssey One series continues… The Empire has set its sights on its next target: human Terrans. As effective allies of the Priminae, the denizens of Earth have proven themselves enemies to the Empire, and now the Imperial forces know more about the Terran home world than ever before...Categorized as:
aliens first-contact invasion military soldiers space-fleet space-opera action-adventure -
![Redemption by Joshua Dalzelle]()
Redemption by Joshua Dalzelle
Rated: 4.41 of 5 stars · 27 ratingsThere is a fine line between right and wrong, good and evil. For years Jason Burke has straddled that line as best he can, always convinced that despite the violence carried out by him and his team they were firmly on the right side of that line. But as he reflects on his time with Omega Force, he begins to have his doubts...Categorized as:
aliens first-contact galactic-empire military soldiers space-fleet space-opera action-adventure -
![Destroyer by Joshua Dalzelle]()
Destroyer by Joshua Dalzelle
Rated: 4.43 of 5 stars · 24 ratingsA relentless enemy… An old wolf's last hunt… The future of two species hanging in the balance… The Darshik war machine is flagging, but the war is far from over. Even as an exhausted Federation military tenses up for a counterattack after repelling the last Darshik invasion, reports are coming in of a new, more powerful class of ship that's striking deep into Terran space...Categorized as:
aliens first-contact invasion military soldiers space-fleet space-opera action-adventure -
![Secret of the Phoenix by Joshua Dalzelle]()
Secret of the Phoenix by Joshua Dalzelle
Rated: 4.40 of 5 stars · 26 ratingsCaptain Jason Burke has begun to suspect that the random attacks on his ship and crew over the last couple of years may not be so random after all. Evidence is mounting that there is something on the Phoenix ... something that powerful factions will stop at nothing to get their hands on...Categorized as:
aliens first-contact military soldiers space-fleet space-opera action-adventure adult -
![Iron & Blood by Joshua Dalzelle]()
Iron & Blood by Joshua Dalzelle
Rated: 4.42 of 5 stars · 24 ratingsThe Black Fleet Saga continues… A human planet has been invaded. The enigmatic Darshik have landed troops on a frontier world and have begun subduing major cities even as their blockade repels all attempts by the fledgling United Terran Federation to mount a counteroffensive...Categorized as:
aliens first-contact invasion military soldiers space-fleet space-opera action-adventure -
![Against All Odds: A Military Sci-Fi Series (Grimm's War Book 1) by Jeffery H. Haskell]()
Against All Odds: A Military Sci-Fi Series (Grimm's War Book 1) by Jeffery H. Haskell
Rated: 4.57 of 5 stars · 7 ratingsThe wrong crew. The wrong ship. The right Captain.Idealistic navy lieutenant Jacob Grimm just wanted to honor his mother’s sacrifice in the last great war. When he’s forced to return fire and destroy a squadron of ships to save his own, he thinks he’s the hero…Until they discover the ships are full of children.Disgraced and denied promotion, Jacob’s career is over...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Return of the Archon by Joshua Dalzelle]()
Return of the Archon by Joshua Dalzelle
Rated: 4.36 of 5 stars · 27 ratingsListening length: 9 hoursEach member of Omega Force carries his own baggage. Most of them are running from their pasts or simply trying to forget them. One member of the small mercenary crew is not who he claims to be, however. When his former life collides with his current one, the team is drawn into a conflict that could have profound consequences for the future of an entire species...Categorized as:
aliens first-contact military soldiers space-fleet space-opera action-adventure adult -
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![The Long Voyage of the Little Fleet by Mackey Chandler]()
The Long Voyage of the Little Fleet by Mackey Chandler
Rated: 4.40 of 5 stars · 10 ratingsIn the first book of this series "Family Law", Lee's parents and their business partner Gordon found a class A habitable planet. They thought their quest as explorers was over and they'd live a life of ease. But before they could return and register their claim Lee's parents died doing a survey of the surface...Categorized as:
aliens exploration first-contact military space-fleet space-opera space-travel action-adventure -
![Shakedown by Scott Sigler]()
Shakedown by Scott Sigler
Rated: 4.40 of 5 stars · 10 ratings"A gritty tale of cosmic dread.”— Pierce Brown, #1 New York Times Bestselling author of RED RISINGFew know the warship’s actual name. Fewer still know what it really is. And almost no one knows of its unique ability, an ability that could tilt the balance of power if not outright win the war.But everyone has heard the rumors. Rumors about the worst place the Planetary Union Fleet can send you...Categorized as:
space-opera military aliens exploration soldiers space-travel space-fleet first-contact -
![The Weak and the Innocent by Ryk Brown]()
The Weak and the Innocent by Ryk Brown
Rated: 4.35 of 5 stars · 27 ratingsEpisode 14 A ship in the hands of their enemy… A liberation gone wrong… A chance to double their ranks… A bold and daring plan… Their support from the Pentaurus cluster dwindling fast, the Alliance faces new and unpleasant realities in the Sol sector. But untoward changes also bring unexpected opportunities… The 'trick' is in how you use them...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Omnia by S.H. Jucha]()
Omnia by S.H. Jucha
Rated: 4.33 of 5 stars · 12 ratingsAlex Racine, who led an elite group of humans and SADEs (self-ware digital entities), left the newly discovered planet of Celus-5 under difficult circumstances. Few of the Harakens with Alex thought there was little he could do to bring peace to the embroiled planet...Categorized as:
aliens exploration first-contact invasion military space-opera space-travel action-adventure -
![Allora by S.H. Jucha]()
Allora by S.H. Jucha
Rated: 4.33 of 5 stars · 12 ratingsUntil the Confederation created Allora, it had produced SADEs (self-aware digital entities) for hundreds of years with enormous consistency and harnessed their capabilities to power the society. But this particular, young SADE was disturbed by her confinement...Categorized as:
aliens first-contact invasion military space-opera space-travel action-adventure adult -
![Celus-5 by S.H. Jucha]()
Celus-5 by S.H. Jucha
Rated: 4.33 of 5 stars · 12 ratingsFor the Sojourn’s initial mission, the Haraken explorer ship undertakes the investigation of Celus-5, a world identified by Willem, a SADE (self-aware digital entity), and his team of scientists, as the best prospect for a new colony.What should be a routine survey mission becomes a disaster. To the Harakens’ surprise, they discover, not one, but two alien species engaged in conflict...Categorized as:
aliens exploration first-contact invasion military space-opera space-travel action-adventure -
![Born of the Ashes by Ryk Brown]()
Born of the Ashes by Ryk Brown
Rated: 4.34 of 5 stars · 27 ratingsEpisode 11 A world in chaos… An eager new ally… A newly acquired ship… An even greater threat on its way… Captain Nathan Scott must decide whether to stand and fight to the end, or live to fight another day… even if it means the end of his world. “Born of the Ashes” is a 122,000 word novel, and is the 11th episode in The Frontiers Saga...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Resistance by Ryk Brown]()
Resistance by Ryk Brown
Rated: 4.34 of 5 stars · 27 ratingsEpisode nine of The Frontiers Saga...A chance to gain much needed resources… A group of highly trained, merciless soldiers… A half-completed ship on a trajectory to nowhere… A lone operative on familiar yet dangerous ground… Captain Scott and the crew of the Aurora have a chance to get everything they need to liberate their home world, but they may have to fight someone else's war first...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Green World by B.V. Larson]()
Green World by B.V. Larson
Rated: 4.42 of 5 stars · 20 ratingsRebels build a secret base on Green World. Their plan is to attack Earth and retake all the planets the Humans have conquered.Hegemony starships gather to strike the Rebels first, but where is their base? As the fleets search, Earth warships trespass into Skay space igniting a fresh border conflict between rival Galactics...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Haraken by S.H. Jucha]()
Haraken by S.H. Jucha
Rated: 4.29 of 5 stars · 14 ratingsNine years of tranquility came to an abrupt end when a Méridien starship entered the Hellébore system, sounding a dire warning for Alex Racine, the Haraken president. Unwanted visitors had arrived again. But this time, they’re not alien; they’re human...Categorized as:
aliens first-contact invasion military space-opera space-travel action-adventure adult -
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![The War Ship: Rise of the Jain, Book Two by Neal Asher]()
The War Ship: Rise of the Jain, Book Two by Neal Asher
Rated: 4.29 of 5 stars · 14 ratingsTheir nemesis lies in wait . . . Orlandine has destroyed the alien Jain super-soldier by deploying an actual black hole. And now that same weapon hoovers up clouds of lethal Jain technology, swarming within the deadly accretion disc’s event horizon. All seems just as she planned. Yet behind her back, forces incite rebellion on her home world, planning her assassination...Categorized as:
aliens first-contact invasion military soldiers space-fleet space-opera action-adventure -
![Rise of the Alliance by Ryk Brown]()
Rise of the Alliance by Ryk Brown
Rated: 4.34 of 5 stars · 26 ratingsEpisode 12A new ally providing aid…An old ally joining the fight…Their resources growing with each passing day…Their homeworld finally on the road to recovery…Things finally seem to be coming together for Captain Scott and the Alliance, as he takes his forces on the offensive. However, the Jung may in turn give him more trouble than he bargained for...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Salvation Lost by Peter F. Hamilton]()
Salvation Lost by Peter F. Hamilton
Rated: 4.30 of 5 stars · 30 ratingsThe comparative utopia of twenty-third century Earth is about to go dreadfully awry when a seemingly benign alien race is abruptly revealed to be one of the worst threats humanity has ever faced. Driven by an intense religious extremism, the Olyix are determined to bring everyone to their version of god as they see it...Categorized as:
aliens dystopia exploration first-contact invasion space-opera space-travel action-adventure -
![Blood World by B.V. Larson]()
Blood World by B.V. Larson
Rated: 4.25 of 5 stars · 16 ratingsA dirty deal was struck. Humanity was allowed to keep three hundred rebellious worlds. In return, we declared war on a powerful enemy from beyond the frontier. A frantic build-up of forces has begun, but the task is hopeless. Seeking allies, Earth’s legions are sent to BLOOD WORLD. A planet on the fringe of known space, where the people only respect masters of combat...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Sol by S.H. Jucha]()
Sol by S.H. Jucha
Rated: 4.35 of 5 stars · 24 ratingsSol’s warships paid the ultimate price for threatening the Haraken and New Terran worlds. Now, Haraken President Alex Racine and his Méridien partner, Renée de Guirnon, are engaged in a desperate gamble to stop a war between their worlds and United Earth’s (UE) massive forces before it starts...Categorized as:
aliens first-contact invasion military space-opera space-travel action-adventure adult -
![Homeworld by Evan Currie]()
Homeworld by Evan Currie
Rated: 4.29 of 5 stars · 30 ratingsWar comes home to the Sol system when the Drasin track a human ship back to Earth, with devastating consequences. Facing massive force of invading alien ships wielding terrible power, the crew of the NAC spacecraft, their allies, and the people of Earth must mount a desperate effort to stop them... -
![Columbus Day by Craig Alanson]()
Columbus Day by Craig Alanson
Rated: 4.25 of 5 stars · 36 ratingsWe were fighting on the wrong side, of a war we couldn't win. And that was the good news. The Ruhar hit us on Columbus Day. There we were, innocently drifting along the cosmos on our little blue marble, like the native Americans in 1492. Over the horizon come ships of a technologically advanced, aggressive culture, and BAM! There go the good old days, when humans only got killed by each other... -
![A Show of Force by Ryk Brown]()
A Show of Force by Ryk Brown
Rated: 4.31 of 5 stars · 27 ratingsEpisode 13 The liberation old worlds… The addition of new allies… The fall of a regime… The death of a trusted friend… The Aurora begins clearing a 20 light year sphere of safety around Earth, taking out Jung forces as they liberate the core systems. However, Captain Scott and the Alliance quickly discover that not every world wants to be liberated, and the Jung have a few surprises of their own...Categorized as:
dystopia exploration military space-opera space-travel action-adventure adult audiobook -
![Connection Unknown by Michael Chatfield]()
Connection Unknown by Michael Chatfield
Rated: 4.50 of 5 stars · 6 ratingsLuke Tavares has dreamed of joining the vast gaming guilds of the hypernet. After recently graduating high school, his parents have given him the same ultimatum as his siblings; he has one month to get a job to pay for his air, gravity, and water aboard the Dahlia.The freighter needs more hands, but Luke doesn’t want to be a trader-ship engineer...Categorized as:
aliens first-contact invasion military soldiers space-fleet space-opera space-travel -
![Explorer by C.J. Cherryh]()
Explorer by C.J. Cherryh
Rated: 4.30 of 5 stars · 27 ratingsIt has been nearly ten years since the starship Phoenix returned to Alpha, the station orbiting the world of the atevi, which had been abandoned following a rift between a faction of the station's inhabitants and the spacers' Pilot's Guild...Categorized as:
aliens exploration first-contact military space-opera space-travel action-adventure adult -
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![Corvus by Marko Kloos]()
Corvus by Marko Kloos
Rated: 4.50 of 5 stars · 14 ratingsWhen the aliens evolve, so does the threat against humanity in this thrilling sequel to Scorpio that finds Alex Archer in an epic battle of survival against the odds and the alien invaders.Alex Archer is a soldier now, the only civilian survivor from Scorpio to join the NAC Defense Corps... -
![The Long-Range War by Christopher G. Nuttall]()
The Long-Range War by Christopher G. Nuttall
Rated: 4.38 of 5 stars · 8 ratingsThe gloves have finally come off ... The Tokomak, the unquestioned masters of the galaxy, have dispatched a massive fleet to crush the Solar Union - and the fledgling Galactic Alliance - before the human race and its alien allies can tear the galactic order asunder. Hundreds of thousands of starships under the command of an alien tactical genius, bent on exterminating the entire human race .. -
![TFS Fugitive by Tori L. Harris]()
TFS Fugitive by Tori L. Harris
Rated: 4.47 of 5 stars · 15 ratingsHaving successfully repelled the Resistance incursion into the Sol system, Terran Fleet Command must now deal with the far-flung worlds of the Sajeth Collective, which sponsored the attack. Task forces are dispatched to Damara and Lesheera to begin the first Human blockades of entire planets...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Rogue World by B.V. Larson]()
Rogue World by B.V. Larson
Rated: 4.29 of 5 stars · 27 ratingsThe Galactics arrived with their Battle Fleet in 2052. Rather than being exterminated under a barrage of hell-burners, Earth joined a vast Empire that spanned the Milky Way. Today, Battle Fleet 921 is returning to Earth. It hasn’t been seen by human eyes since our blissful day of Annexation...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Intruder by C.J. Cherryh]()
Intruder by C.J. Cherryh
Rated: 4.31 of 5 stars · 24 ratingsThe civil war among the alien atevi has ended. Tabini-aiji, powerful ruler of the Western Association, along with Cajeiri his son and heir, and his human paidhi, Bren Cameron, have returned to the Bujavid, their seat of power.But factions that remain loyal to the opposition are still present, and the danger these rebels pose is far from over... -
![Angles of Attack by Marko Kloos]()
Angles of Attack by Marko Kloos
Rated: 4.15 of 5 stars · 26 ratingsThe alien forces known as the Lankies are gathering on the solar system's edge, consolidating their conquest of Mars and setting their sights on Earth. The far-off colony of New Svalbard, cut off from the rest of the galaxy by the Lanky blockade, teeters on the verge of starvation and collapse. The forces of the two Earth alliances have won minor skirmishes but are in danger of losing the war... -
![TFS Navajo by Tori L. Harris]()
TFS Navajo by Tori L. Harris
Rated: 4.25 of 5 stars · 12 ratingsOnly a few short months after Humanity’s first interstellar flights, the first shots have been fired in what will eventually become known as the Alliance Wars. Terran Fleet Command teeters on the edge of chaos in the aftermath of Chairwoman Crull’s removal from power, while in space, Earth’s defense falls squarely on the shoulders of Admiral Kevin Patterson...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Battleship Indomitable by David VanDyke, B.V. Larson]()
Battleship Indomitable by David VanDyke, B.V. Larson
Rated: 4.25 of 5 stars · 12 ratingsFrom Hugo Award finalist David VanDyke and million-selling science-fiction legend B.V. Larson comes book two in the epic military space opera adventure saga!Commodore Straker's rebellion grows in strength--but his enemies are growing even faster...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Earth Fleet by B.V. Larson]()
Earth Fleet by B.V. Larson
Rated: 4.25 of 5 stars · 12 ratingsAt long last Earth has a handful of starships. Surrounded by Rebel Kher, Imperials and the mysterious Nomads, Humanity dares to assert our right to independence. The interstellar community reacts harshly. In the eyes of our neighbors, we’re upstarts, dangerous beings that don’t know our place. For the Kher, freedom can only be won through battle...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Deep Black (Infinite Sky #1) by Samuel Best]()
Deep Black (Infinite Sky #1) by Samuel Best
Rated: 4.25 of 5 stars · 12 ratingsTwo crews return to Titan. Who will survive?Titan. Sixth moon of Saturn. A deadly enigma harboring the greatest secret in the history of humankind.In the wake of the first mission, two companies with very different goals plot a return to that distant moon. Their ships are safer, their technology has improved…and they want answers... -
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![TFS Theseus by Tori L. Harris]()
TFS Theseus by Tori L. Harris
Rated: 4.21 of 5 stars · 14 ratings“Welcome to the Pelaran Alliance …” With those simple words, the Guardian spacecraft openly revealed itself to Humanity, heralding a new chapter in its 500-year-long mission to cultivate our world...Categorized as:
aliens exploration first-contact galactic-empire invasion military soldiers space-fleet -
![Méridien by S.H. Jucha]()
Méridien by S.H. Jucha
Rated: 4.21 of 5 stars · 14 ratingsThe Méridiens are fleeing to their far colonies—and they have reason to run. Over the course of decades, they have lost hundreds of ships, billions of people, and seven Confederation colonies to an alien enemy: an advancing swarm of silver ships transported in the bowels of a gigantic, spherical vessel...Categorized as:
aliens first-contact invasion military space-opera space-travel action-adventure adult -
![The Human by Neal Asher]()
The Human by Neal Asher
Rated: 4.21 of 5 stars · 14 ratingsA warship is laying waste to the galaxy, making for unexpected allies in the face of incredible acts of war. This is the high-octane conclusion to Neal Asher's Rise of the Jain trilogy.An entire galaxy hangs in the balance.A Jain warship has risen from the depths of space, emerging with a deadly grudge and a wealth of ancient yet lethal technology... -
![Into the Stars by James Rosone]()
Into the Stars by James Rosone
Rated: 4.21 of 5 stars · 14 ratingsThe stars are within mankind’s reach……But what awaits in the void may end humanity…Mars and the Moon have been colonized, piracy runs rampant in the asteroid belts, and a thriving society grows in the depths of space. Humanity prepares to embark upon its greatest journey—the colonization of Alpha Centauri...Categorized as:
aliens first-contact galactic-empire invasion military soldiers space-fleet space-opera -
![Prelude to Extinction by Andreas Karpf]()
Prelude to Extinction by Andreas Karpf
Rated: 4.21 of 5 stars · 14 ratingsEarth's first interstellar mission -- An alien colony in ruins -- Their fight for survival has only just begun.When Jack Harrison climbed down the short ladder from the airlock and stepped onto the debris covered soil, the ground crackled with the sound of dried leaves and twigs...Categorized as:
aliens dystopia exploration first-contact invasion space-opera space-travel action-adventure -
![Home World by B.V. Larson]()
Home World by B.V. Larson
Rated: 4.27 of 5 stars · 26 ratingsThe Galactics arrived with their Battle Fleet in 2052. Rather than being exterminated under a barrage of hell-burners, Earth joined a vast Empire that spanned the Milky Way. When the Earth is invaded by a rival empire, James McGill’s legion must defend the Home World. The top brass has complex plans, but none of that matters much to McGill, who chooses his own unique path...Categorized as:
aliens dystopia exploration first-contact galactic-empire invasion military soldiers
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