When Sinbad's ship gets damaged in a freak storm he and the crew take refuge on what seems to be a deserted island. They meet a teenage boy named Mutaro who says he is the sole survivor of a shipwreck. The boy immediately takes a shine to Bryn while the rest of the crew are repeatedly attacked by a mysterious, invisible monster. Sinbad begins to suspect that there is some connection between boy and beast.
—Denis Belton