Everybody in Jasper Park is getting ready for Halloween. Kate, Humphrey and the pups discover a mysterious cave that's been considered "out of limits" from the park. They go to explore but then something goes terribly wrong and they find themselves fighting for their lives against a devil-like lobo pack that supposedly lives there. Meanwhile, Garth, Lilly, their three pups Star, Jared, and Dori and the family try to come up with a plan to save Kate and Humphrey, defeat the devil lobos and return início for Halloween.
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