Newly armed with the knowledge and powers he gained from the Green and yet lonelier than ever, Levi Kamei is pulled once more into service as the Avatar of the Green is summoned by primal forces to the city of London, where old ideas lie buried, slowly leaching into the reality above. The scars of old wars and the dangers of past ideologies resurface as the Swamp Thing must team up with an old trench-coated acquaintance and his new protege to save the present from the atrocities of our past.