Rhaid i'r criw rwystro criw o bengwiniaid rhag disgyn i mewn i agendor rhew. Capten Cwrwgl and Professor Iago work together to prevent a group of penguins from falling into an ice chasm.
Mae'r Octonots yn mynd ar antur i ddod o hyd i gefnder pell Yr Athro Wythennyn, sef yr Ystifflog Mawr gwibiog, er mwyn tynnu llun ohono. The Octonauts and the Giant Squid.
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