It was another day in Gravity falls. The twins were doing their own thing when Dipper wanted to go mythical creature searching. Mabel wanted to come with Dipper to look in the forest for any new mythical creatures he could find. So that's what they did.

They couldn't find anything

Dipper : "Ugh, there's no new mythical creatures! We've found nothing so far!"

Mabel: "I'm sure we'll -"

She got interrupted by a loud bang that came behind them.

(You can pick your creature btw)