Moby Dick and the Mighty Mightor

The Cereb Men [Moby Dick] (1x32)

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Tom, Tubb Scooby and Moby witness the evil Cereb Men attacking a city. Upon investigation they discover that the King's son, Prince Zor, prisoner. They demand complete surrender of the city in return for the prince. Can the four friends save Prince Zor and the underwater city?