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Yr Octonots a'r Selacanth
Wrth nofio mewn ogof dywyll, daw'r Octonots ar draws ffosil o bysgodyn grymus o'r oes o'r blaen. While diving in a dark, spooky cave, the Octonauts discover the fossil of a prehistoric fish.
Ar y Teledu
Yfory
08:10
Rhagor o benodau
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