Spartan is a living legend, a veteran of the Alliance Marine Corps, victor of a multitude of military campaigns including the horrific Biomech War. He is both loved and reviled by friend and foe alike, and now lives out on the fringes of the Alliance. He has fought for money, for his people and for the very survival of his species, and lost everything in the process. But when two of his closest friends are captured supplying weapons to the desperate Byotai settlers of Karnak, the fight becomes personal.

Aliens exist...and, as it turns out, most of them aren’t that friendly. Jacob Brown wasn’t even born yet the first time they attacked Earth. He was only 14 the second time it happened. When Earth finally came together and fielded its first spaceborne military, Jacob didn’t hesitate to volunteer. Serving aboard a mighty starship, he’d be able to defend his planet - and his family - when, inevitably, they came again.

You ever have one of those days? U.S. Marine Sergeant Jake Bayard did when he has to cancel a hot date to board a transport plane to the South Pole, which is hijacked by aliens with hostile intent to Earth. Bayard escapes into tunnels deep under the ice and stumbles upon advanced technology that teleports him to Epsilon Eridani. Desperately alone and on the run, Bayard falls back onto his combat training, soon discovering that these aliens keep human herds for meat. That’s it. He enlists some of the downtrodden and declares war against the hungry oppressors.

Thousands of crew are reported dead, including the ship’s captain. Reluctantly, the young XO, Galvin Quintos, will be taking command of the fleet's crippled dreadnaught, the USS Hamilton, while doing his best to bring fleet survivors back to Earth. To make matters worse, there’s a murderer running loose on board the ship, critically low fuel levels, and the Grish are back, in fast pursuit and ready to finish what they’d started. Only by sheer luck - and a good measure of cagey smarts - will Quintos be able to rise to the challenge.

In the 20th century Earth sent probes, transmissions, and welcoming messages to the stars. Unfortunately, someone noticed. The Galactics arrived with their battle fleet in 2052. Rather than being exterminated under a barrage of hell-burners, Earth joined their vast Empire. Swearing allegiance to our distant alien overlords wasn't the only requirement for survival. We also had to have something of value to trade, something that neighboring planets would pay their hard-earned credits to buy. As most of the local worlds were too civilized to have a proper army, the only valuable service Earth could provide came in the form of soldiers....

Star Dreadnought Bismarck is the Vrokan Empire’s latest weapon, a monstrous warship of a size and power never seen before that could turn the tide of the war. It is the sixth year of the Void Wars, and only the allies of the Commonwealth remain standing against the unstoppable tide of the brutal Vrokan Empire, still unwilling to yield after numerous setbacks. When a fortuitous reconnaissance flight spots the behemoth leaving port, they know they must act before it can break out into open space, and begin its mission.

The 26th century. Humanity has expanded beyond Earth’s system to hundreds of planets that colonists now call home. But the United Earth Government and the United Nations Space Command is struggling to control this vast empire. After exhausting all strategies to keep seething colonial insurrections from exploding into a full-blown interplanetary civil war, the UNSC has one last hope.

Kyle Riggs is snatched by an alien spacecraft sometime after midnight. The ship is testing everyone it catches and murdering the weak. The good news is that Kyle keeps passing tests and staying alive. The bad news is the aliens who sent this ship are the nicest ones out there.

The overthrow of the Republic is complete. The Separatist forces have been smashed, the Jedi Council nearly decimated, and the rest of the Order all but destroyed. Now absolute power rests in the iron fist of Darth Sidious - the cunning Sith Lord better known as the former Senator, now Emperor, Palpatine. But more remains to be done.

The Hundred Worlds have withstood invasion by the relentless Hok for decades. The human worlds are strong, but the Hok have the resources of a thousand planets behind them, and their fleets attack in endless waves. The long war has transformed the Hundred Worlds into heavily fortified star systems. Their economies are geared for military output, and they raise specialized soldiers to save our species. Assault Captain Derek Straker is one such man among many.

Though the ragtag group of misfits known as the Black Star Renegades won a decisive battle by destroying Ga Halle’s War Hammer, the war is far from over. In response to losing the crown jewel of its fleet, the Praxis empire has vengefully reinforced its tyranny across the galaxy - but its rule won't be had so easily. Led by hotshot pilot Kira Sen, a growing rebel force stands in the way of Praxis’ might. Not only do they possess the will to fight for galactic freedom, they also possess the ultimate ace in the hole: the mythical Rokura, the most powerful weapon ever known.

After seven long years of conflict, the Horus Heresy nears its end. But now, as the Warmaster Horus marches on Terra to rip his father from the Throne, the seat of the arch-traitor’s power lies empty. Cthonia, a world once dominated by brutal murder-gangs, is occupied by the Emperor’s praetorians—the indomitable Imperial Fists. For the Sons of Horus, this outrage demands a reckoning.

Nate has a talent for space combat after hundreds of victories in the Star Crusader videogame simulation. His skills are unique, enough to gain him a rare privilege: the chance to join five other Alliance cadets and escape the dull routine of the classroom. They will enter a fierce competition light-years away in the ancient Byotai Empire. Yet days after their arrival a rebellious faction begins a bloody mutiny that spreads like wildfire. The time for competition has ended; the time of war has begun.

Captain Mitchell "Ares" Williams is a space marine and the hero of the Battle for Liberty whose shot heard 'round the universe saved the planet from a nearly unstoppable war machine. He's handsome, charismatic, and the perfect poster boy to help the military drive enlistment. Pulled from the war and thrown into the spotlight, he's as efficient at charming the media and bedding beautiful celebrities as he was at shooting down enemy starfighters.

James Cook was a gamer headed for the biggest gaming match on Earth. Instead the Planetary Defense Force kidnapped him, his team and 20,000 others. Their alien trainers don't care how many of them survive, they only care that they can fight. James Cook was a gamer, but his avatar Salchar, he was a fighter, a leader, and the man the recruits need. James must put his doubts about himself aside, there's no guide to this, no strategy and it's definitely not a game. He will need to become Salchar, with one goal, to protect his people.