Wedi i storm daro'i Danddwr mae braich Capten Cwrwgl yn cael ei dal mewn cragen fylchog. The Octonots and the Manatees. When his Gup is struck by lightning, Capten Cwrwgl gets t ...
Mae Harri a Dela yn cael eu dal gan greadur rhyfedd iawn yn ddwfn yn y môr. Harri and Dela become entangled in a strange deep-sea creature - a siphonophore.
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