Martin Mystery (2003)

S1E7 Mark of the Shapeshifter

Title: The Shapeshifter's Curse Plot: As construction workers vanish without a trace, the community grows increasingly anxious. The mystery deepens when it is revealed that a local Native American has the ability to transform into a werewolf. He is using his powers to abduct the workers, taking them to a hidden realm inhabited by werewolves. As tensions rise, the remaining crew must uncover the truth and find a way to rescue their missing friends before they too fall victim to the shapeshifter's dark magic.