Que Legal, Scooby-Doo! Temporada 1 Episódio 7

To solve the mystery of a creepy Crystal Crawler - a bat-like cave monster - the Gang must venture into the Crystal Canopy - a labyrinth of intricate crystal formations. To make things worse, they cant speak a word while in the Canopy, because even the slightest sound will bring the crystals crashing down around them!