Jonny Quest (1964) - 1x25 - Monster in the Monastery- Followmy.tv

Bigfoot look-a-like monsters attack a village from a monastery connected only by a rope bridge in the mountains. People are scared of this monastery because they believe it to be haunted by monsters which later turn out to be humans dressed in costumes. As the Quest teams figures this out they engage in a clumsy battle with the fake monsters. A surprise happens in the end when a real Sasquatch monster kills all those who wore the costumes and heads back into his cave in the mountains.