A young man must risk his life to save his fire-breathing friend from the unscrupulous owner of an amusement park.
Young John McGowan travels to Scotland to live at his grandfather's castle after he loses his parents in a traffic accident. At the wishing tree he conjures up a dragon friend, Yowler. They grow up together, and one day documentary film maker Bob Armstrong and his daughter Beth stumble upon Yowler. Hungry for fame (and money), Bob convinces John to "rent" Yowler to local unscrupulous businessman Lester McIntyre. John is convinced in part by the offer to have the outstanding taxes on the castle paid off, partly because of his growing interest in Beth. Yowler is miserable in the new theme park built for him, and when it becomes clear that McIntyre has tricked them in order to exploit the dragon, John and his new friends take action.
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