Da un antico passato

Professor Verybad pays a visit to Zagor and Cico. A mysterious metal orb, found in the silt from a flood, is exposed as a local curiosity in a saloon at Shelford, a remote village in Darkwood. Based on second-hand news, the Professor thinks that the mysterious artifact could have the same origin as the monstrous alien contraption found buried under the Gray Mountains, in a dramatic adventure where they were all involved a few years before. Verybad wants to go to Shelford to find out the truth about it and asks Zagor to go with him. But someone else is interested in the strange find, too... And monstrous apparitions will ensue...