The Scooby-Doo/Dynomutt Hour (1976)

S1E3 The Fiesta Host is an Aztec Ghost

While on a trip to Mexico, Scooby-Doo and the gang find themselves on a quest for lost Aztec treasure. They arrive in Cinco, a town that should be bustling with a festive celebration, but instead, it’s eerily empty due to its inhabitants being frightened away by a stone creature and the spirit of The Aztec God Of Contezuma. As they investigate the area for an ancient pyramid, they uncover leads that take them to a secretive river barge and a hidden cave where the treasure is being illicitly taken.