The Sentinels Series by Jack McKinney

It was 2020. Six years had passed since the destruction of the Super Dimensional Fortresses 1 and 2, that final tragedy of the First Robotech War. But Earth was on the mend now, and from the wreckage of those ships the Robotech Defense Force had succeeded in fashioning a new battle fortress — the SDF-3. Its mission: to cross the galaxy and make peace with Tirol's Robotech Masters... moreIt was 2020. Six years had passed since the destruction of the Super Dimensional Fortresses 1 and 2, that final tragedy of the First Robotech War. But Earth was on the mend now, and from the wreckage of those ships the Robotech Defense Force had succeeded in fashioning a new battle fortress — the SDF-3. Its mission: to cross the galaxy and make peace with Tirol's Robotech Masters.It sounded straightforward enough; but unknown to Admirals Rick and Lisa Hunter and their crew of thousands, the Robotech Masters were already on their way to Earth!Nevertheless Tirol would have a greeting in store for the Expeditionary Mission: an incendiary salute from the warlord whose hordes had conquered half the galactic Quadrant — the Invid Regent! Threatened with a swift and violent end, and suddenly torn by internal struggles for power, the RDF would find itself thrust into a savage war for survival! less

The Robotech Expeditionary Force had been stranded on the far side of the galaxy as the result of damage to their Super Dimensional Fortress during the battle with the Invid hordes. Their chances for survival were slim... moreThe Robotech Expeditionary Force had been stranded on the far side of the galaxy as the result of damage to their Super Dimensional Fortress during the battle with the Invid hordes. Their chances for survival were slim.Suddenly, a starship unlike anything that had ever flown before appeared — manned by an incredible assortment of beings who meant to challenge the might of the Invid Regent himself!REF volunteers signed aboard, with their might war mecha in tow, for a campaign that would either mean the total destruction of the freedom fighters or liberty for the planets of — The Sentinels. less

Marooned On A Doomed World!Four months passed without a word from the Sentinels, and the members of the Expeditionary Mission to Tirol were beginning to fear the worst. This, even as they entered into truce negotiations with the being who might have been responsible for the destruction of the Sentinels' starship -- the Invid Regent himself... moreMarooned On A Doomed World!Four months passed without a word from the Sentinels, and the members of the Expeditionary Mission to Tirol were beginning to fear the worst. This, even as they entered into truce negotiations with the being who might have been responsible for the destruction of the Sentinels' starship -- the Invid Regent himself.Meanwhile, the survivors of the Farrago remained hopelessly stranded on Praxis, a planet in cataclysm, hastened to endtime by the dark designs of the Invid Regis. But deep within that world's transformed core were answers to the Sentinels' prayers; if they could only reach them before Praxis tore itself apart. For Rick and Lisa Hunter, Cabell, and the others, the moment had arrived for desperate actions...And Time Was Running Out! less

#1 The Devil's HandIn 2020, a new battle fortress, the SDF-3, was tasked with a trip across the galaxy to make peace with Tirol's Robotech Masters. But the Robotech Masters were already on their way to Earth. And at Tirol, the SDF-3 would face the galaxy's fiercest warlord: the Invid Regent!#2 Dark PowersStranded on the far side of the galaxy after battling the Invid hordes, the Robotech Expeditionary Force's chances for survival were slim... more#1 The Devil's HandIn 2020, a new battle fortress, the SDF-3, was tasked with a trip across the galaxy to make peace with Tirol's Robotech Masters. But the Robotech Masters were already on their way to Earth. And at Tirol, the SDF-3 would face the galaxy's fiercest warlord: the Invid Regent!#2 Dark PowersStranded on the far side of the galaxy after battling the Invid hordes, the Robotech Expeditionary Force's chances for survival were slim. But suddenly a starship unlike any other appeared -- manned by an incredible assortment of beings determined to challenge the Invid Regent himself! REF volunteers and their war mecha signed on for a campaign that would mean their destruction -- or liberty for the planets of the Sentinels!#3 Death DanceFour months had passed without a word from the Sentinels. Fearing the worst, the Expeditionary Mission to Tirol began truce negotiations with the Invid Regent himself. But far away, the surviving Sentinels were stranded on Praxis, a planet in cataclysm. Deep within that world's core were answers to the Sentinels' prayers -- if they could only reach them before Praxis tore itself apart... less

Optera! Birthplace of the Flowers of Life and their agents of retribution, the Invid . . . nexus for an unfolding of events that had left the galaxy reshaped and redefined . . . and now the focal point of the Sentinels' long campaign to liberate the Quadrant from the Regent's tyranny.Edwards is on his way to Optera, in flight from Tirol with his prisoner Lynn-Minmei and a handful of Invid Inorganics under his control... moreOptera! Birthplace of the Flowers of Life and their agents of retribution, the Invid . . . nexus for an unfolding of events that had left the galaxy reshaped and redefined . . . and now the focal point of the Sentinels' long campaign to liberate the Quadrant from the Regent's tyranny.Edwards is on his way to Optera, in flight from Tirol with his prisoner Lynn-Minmei and a handful of Invid Inorganics under his control. So too are Breetai's Zentraedi -- closing on the very world the Imperative bade them defoliate generations ago -- and the renegade forces of Tesla, mutated beyond recognition by the fruits of the Flower.The Sentinels themselves are not far behind. However, they have Peryton to deal with first -- a godforsaken planet cursed by fate and time itself. But what awaits Rick, Lisa, and the Human Sentinels there is a mere primer for what is to come: the realization that they have journeyed across the galaxy . . . to wage war against each other! less