When the USS Saratoga passes close to the planet, Vesta Colony, where the Earth colonist were attacked, West goes AWOL and flies down to the planet in hopes that his girlfriend, Kylen, somehow survived.

The Saratoga has a mysterious new passenger: a battle-scarred special-forces commando whose classified mission directives put the 58th at his disposal, even if it means leading them to certain disaster.

The Saratoga becomes a pressure cooker of violence and political intrigue when an assassination on Earth forces a delegation of UN officials to use the craft as the site of an important conference.

The soldiers of the 58th become their own worst enemies when a routine supply mission goes awry, leaving them stranded in alien territory and suffering from the effects of a mysterious Chig weapon.

A commandeered alien battleship provides the 58th with information about an important Chig outpost, giving the Earth forces an opportunity to make a Trojan-horse attack against the enemy-if the 58th can learn to fly the craft in time.

After narrowly escaping the crippled alien battleship, the 58th finds itself imprisoned in the catacombs of a Chig penal colony. While Wang suffers in an alien torture chamber, Nathan encounters someone he'd only dreamed of seeing again.

Christmas Eve finds the 58th in dire straits: its transport vehicle, damaged in battle, is hurtling uncontrolled into enemy territory and the pilots must struggle to stay alive with no power, no weapons, and no hope of being rescued.

Shane risks her life when she volunteers to fight an enemy spacecraft with another squadron, led by a former boyfriend whose new love was killed during a mission.

McQueen seeks reinstatement of his pilot status so he can fly what could be a suicide mission: find and destroy a seemingly invincible Chig super-bomber.

West discovers that his brother has enlisted in the Corps and is serving under a young, gung-ho lieutenant who's so determined to make a name for himself as a soldier, that he will risk endangering the lives of his entire battalion.

The members of the 58th receive letters from home, some with good news, some with bad, while McQueen and Cooper are ordered to cooperate in a TV documentary about In Vitroes serving in the United States Marine Corps.

The exhausted Wild Cards are granted R&R aboard the Bacchus, a pleasure ship where it's said anything can, and does, happen.

A mysterious group of extremely high-ranking officers disembark on the Saratoga and the 58th are ordered to escort an unresponsive space APC. The mysterious APC suddenly locks on their Hammerheads and opens fire.

When Commodore Ross sees there's an opportunity to launch a potentially crippling offensive against the Chigs. Forced to abandon the 58th on a barren planet, Ross leaves the marines to fend for themselves with little ammo, no food-and no hope of rescue.

The 58th is deployed to a seemingly barren moon to make final preparations for a major offensive by the Earth forces, but when they arrive they discover that the moon is home to an unknown species-and that Operation: Roundhammer may cause its extinction.

While peace talks on the USS Saratoga go awry, the disgraced 58th are sent to retrieve POWs trapped in a crippled Space APC. Several enemy space fighters attack and the 58th take heavy losses. It is discovered the Chigs are only offering peace because they know Earth's military will defeat them.