Scooby-Doo! and the Monster of Mexico is the sixth of a series of direct-to-video animated films based upon the Scooby-Doo Saturday morning cartoons. It was released on September 30, 2003, and it was produced by Warner Bros. Animation (though done in a retro format resembling the classic 1970s Hanna-Barbera cartoons).
Fred's pen-pal Alejo Otero, who lives in Veracruz, Mexico, invites Fred and the rest of the gang to visit him and his family there. Fred and the rest of the gang talk about it until they decide to go. However, after Alejo sent the invitation to Fred, a monster started to terrorize the population of Veracruz. Both Alejo and his son see the monster, and the locals start calling it la chupacabra.
Later, when Mystery, Inc. arrives in Veracruz, they meet Alejo who recognizes them all from Fred's letters. Alejo runs a huge and fancy hotel, and he shows them around and where they will be staying. He then shows them his family which include his wife Sofia, his mother Doña Dolores, his brother Luis, and Luis's fiancée, Charlene. Luis tells the gang he met Charlene when he visited America, at a theme park run by Mr. Smiley. The gang and the family enjoy a meal, and Dolores