Young Hercules

The Beasts Beneath (1x43)

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Hercules, Iolaus, Lilith, Theseus and fellow cadet, Marco, find themselves trapped in a large area of sand known as the Dune Sea. It's known as forbidden and for a reason too, since it is inhabited by sand sharks who hunt anyone foolish enough to enter the area. Of the five cadets who entered, one will not leave.