The Trip to El Dorado:

The Trip to El Dorado is the fifteenth episode of Scooby Doo R.P.M.

Plot
The Mystery Hunters lead Mystery Inc., Fossil 5, the Sea-Hounders, the Fuji-Finders, the Mystery-Society, and the Mystery-Sleuths to El Dorado..... a lost world where Mayans dwell. But trouble comes in the form of a ghostly priest named Meccoz who seeks to return the land to the old times of human-sacrifices.