Wrth ddychwelyd adre' ar ôl antur ar afon yn Affrica, mae'r Octonots yn cael trafferth mynd heibio criw o hipos mawr. The Octonauts have trouble getting past a gang of large hip ...
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 preh ...
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