Dr. Portillo and Fred in “Unfinished Business”

The peoples have long told the tale of Qué Horrífico. A normal man by day, but every sundown he changes into Qué Horrífico. He roams through the villages and plays his song of mystery on a pan flute, turning the childrens into... Terriblegatos!

In America, we call it 'getting spookified'.

That is good enough, thank you. Eventually, he takes them to his spooky town, or cave or something. There's a lot of debate on that, who can really know.