Otto has become King of England. No, it's not a joke - he has the opal.Diana, Darlene and Mossop have been imprisoned and Bubbles has formed a Robin Hood style rebellion while Penelope becomes a secret agent.
Diana becomes an environmentalist and accepts an invitation to join Otto, who claims he is now a greenie. But it is just a plot to get the opal, and it works. Overwhelmed with his new power Otto makes himself King of England and throws Mossop, Diana and Darlene into the dungeons. Bubbles forms the 'Merry Chaps in Green' in the Forest to end King Otto's reign.