"Sinestro Corps Prologue: The Second Rebirth" & "Tales of the Sinestro Corps: The Greatest Once, The Greatest Again" Continues in Green Lantern (Vol 4) #21. Hal Jordan has struggled to regain his reputation. Kyle Rayner has suffered great personal loss and reluctantly gained great power. Guy Gardner's trust in the Guardians is wavering. John Stewart's unbreakable loyalty soon will be tested. Together, these four men are the Green Lanterns of Earth but why are so many Earthmen recruited into the Corps? What is their ultimate role in the future of the universe? And how will the secret of the rings' power threaten the Guardians and affect Hal Jordan's future?