Mosaic: Part 4 of 4. "Structures!" Starring Green Lantern (John Stewart). Guest-starring Green Lantern (Hal Jordan). The Mosaic is coming apart at the seems and John Stewart is the only one who can hold it together. Plus, the Guardians reveal their intentions and John is not happy about it. Don't miss a major turning point in the life of this Green Lantern. NOTE: John Stewart's mission continues in Green Lantern: Mosaic.