Miles below the seabed, Project Tiamat has awoken a volcanic entity from beyond the heavens. Now Advick Goose, in place of his late mentor the titular Doctor WHeasel, and some of the Project’s scientists must find a way to placate this strange visitor or risk a volcanic disaster for Earth. All this, plus the long-awaited, and lightly dreaded, return of a missing key cast member, in the final part of this adventure.