Sentinels (Robotech Omnibus, Vols. 1-3: Devil's Hand, Dark Powers, Death Dance)

#1 The Devil's Hand

In 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 Powers

Stranded 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 Dance

Four 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...