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; after some discussion, they decide to go. However, after Alejo sent the invitation to Fred, an unrealistic-looking monster started to terrorize the population of Veracruz. Both Alejo and his son Jorge see the monster, and the locals start calling it El 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 talks about her late husband. Then, a man named Señor Fuente arrives and asks to speak with Alejo and Luis. Dolores tells the gang that Fuente has been trying to get her to sell the hotel to him ever since her husband died. Meanwhile, Alejo and Luis tell Fuente once again that they do not want to sell the hotel. Fuente leaves, and the family go inside because of a fierce storm. When inside, Alejo is forced to tell the gang about the monster. He says that he does not have many other guests besides the gang because El Chupacabra has been scaring them away. Luis and Charlene tell the gang to lock their doors when they go to sleep.
During the night, Shaggy and Scooby-Doo are scared when they think they hear a noise. They then hear a loud growl and run screaming out of their cottage. They wake up Fred, Velma, and Daphne. After seeing footprints outside of Shaggy and Scooby's window, Fred declares that there is a mystery they have to solve.
The next day, the gang, Alejo, and Luis set out to search for the monster. Charlene gives Luis a charm for good luck. Daphne interviews the townspeople, but none of them are able to find El Chupacabra. When they get back to the van, they find someone has written on it, threatening them to either go away or not see tomorrow. The gang realizes this is serious and decide to search at night. Fred, Velma, and Daphne go one way, Alejo and Luis go another way, and Shaggy and Scooby stay at the van.
At night, Shaggy and Scooby sleep in the van, while someone takes away their brake fluid. Fred, Velma, and Daphne search the woods, and find El Curandero, a medicine man. El Curandero tells them they need to look at history and that they are in grave danger.
Meanwhile, Alejo and Luis are searching when Alejo sees El Chupacabra. Alejo is chased and nearly falls off a cliff, but he manages to hold on. He calls for Luis, but there is no answer. The monster disappears, and Luis shows up, saying he was hit on the head by the monster. Luis helps his brother up from the cliff.
Shaggy and Scooby start driving, but when they realize they cannot stop, they get scared. They meet up with Fred, Velma, Daphne, Alejo, and Luis who where being chased by El Chupacabra. Eventually, the van runs out of gas and stops right in front of a gas station. The van gets fixed, and Alejo gets some ice for Luis's head wound, but Luis does not have a bump on his head. Luis says he is fine.
The gang drives along and finds a sign to a history museum, and thinking that is what the medicine man said, go to it. When they get there they meet a suspiciously hyper Museum guide who leads them into an auditorium. There they see a performance about Mexican customs. The guide then makes Daphne volunteer, and she kidnaps her, vanishing with a puff of smoke. The rest of the gang find a secret passageway and follow it, until they come to some Aztec pyramids. They find Daphne at the top of one and rescue her, but the tourists chase after them, thinking they have stolen something. After a long chase scene, they finally return home. However, it is revealed the good luck charm Luis has is really a tracking device.
The next day is the Day of the Dead, and everyone goes to the cemetery; there they find out from Dolores that Charlene has been captured by El Chupacabra. The family gives offerings to the grave of Señor Otero and hope Charlene can be found. Suddenly, the ghost of Señor Otero comes out of his grave and tells them to sell the hotel and the land or they will be in danger. The family cannot believe that Señor Otero would want them to sell, but Scooby realizes something is suspicious. He follows a scent until he finds a man in a skeleton suit controlling the ghost. The gang catches him, and he is revealed to be Mr. Smiley. Then, El Chupacabra appears and scares everyone.
After chasing the gang, the monster is caught up in some wiring. The gang pulls off the mask, and it reveals the museum guard they saw earlier is the monster. She tells them she loves Mr. Smiley and that they were going to get all the land. Luis asks what happened to Charlene, and the guard tells him he will never see her again and he should forget about her. Velma then guesses something is up and realizes the face the guard has is a mask, and pulls it off to reveal that Charlene was the guard and El Chupacabra. Fred says that the message written on the van was not in proper Spanish, so it had to be someone who did not speak Spanish. Señor Fuente says that he did want the land, but he respects that the family does not want to sell. Charlene and Mr. Smiley are taken to jail, and everyone enjoys the Day of the Dead.
Cast and characters
|Frank Welker|| Scooby-Doo|
|Casey Kasem||Shaggy Rogers|
|Heather North Kenney||Daphne Blake|
|Nicole Jaffe||Velma Dinkley|
|Jesse Borrego|| Luis Otero|
|Maria Canals|| Sofia Otero|
Old woman #2
|Brandon Gonzalez||Jorge Otero|
|Castulo Guerra|| Señor Fuente|
|Benito Martinez|| El Curandero|
|Darlene Mendoza|| Natalia Otero|
|Candi Milo|| Charlene/|
Old woman #2
|Rita Moreno|| Doña Dolores|
|Allyse Rivera||Carolina Otero|
|Casey Sanio|| Sebastian Otero|
|Eddie Santiago|| Alejo Otero|
|Rip Taylor|| Mr. Smiley/|
Ghost of Señor Otero
|"Viva Mexico"||Written by Rich Dickerson & Gigi Meroni||Maria Carmen Diaz|
|"Scooby Cha Cha Doo"||Maria Carmen Diaz & Rich Dickerson|
|"Sol (Batucada)"||Written by Gilberto Cerezo, Ulises Lozano, Carlos Chairez, Omar Gongora, Cesar Pliego||Kinky|
|"A Donde Vas"||Written by Kike Santander & Javier Gaviria||Carolina|
|"Muee Mi Sangre"||Written by Artro Santillanes & Janko Rodriguez||Plastiko|
|Señor Fuente||He had been trying to get Alejo and Luis to sell their family hotel to him.|
|El Curandero||He knew all about the Chupacabra. He warned the gang they were in great danger.|
|Luis Otero||He said he was hit on the head by the monster, but he did not have a bump on his head.|
|Museum guide||She and her warrior friends kidnapped Daphne.|
| Charlene as the Museum guide and the Chupacabra|
|To get land for an amusement park.|
- Instead of the correct reptillian (or canid) monster, a purple Bigfoot was used for the Chupacabra.
- During one of the chase scenes, the gang stops at a movie theater. A movie titled, Legend of the Vampire is seen in the marquee. This is a reference to the previous film, Scooby-Doo! And The Legend Of The Vampire.
- This is the last time Heather North and Nicole Jaffe voice Daphne and Velma, respectively, with their successors being, Grey DeLisle and Mindy Cohn, respectively.
Animation mistakes and/or technical glitches
- None known.
Inconsistencies/continuity errors and/or goofs/oddities
- The homes the gang live in could be set in Coolsville, but that's not outright confirmed.
- While in split-screen, the gang go from speaking out loud to themselves then typing to just speaking and everybody seemingly knowing what each other is saying. The four-way split-screen could be breaking the "fourth wall" for them.
- El Chupacabra was claimed by the producers as Mexico's version of Bigfoot, although such a description is grossly inaccurate, as the chupacabra described is quite different from Bigfoot. There's two popular depictions of the creature: 1) is a strange reptilian (sometimes humanoid) beast with big red eyes and sharp teeth. 2) a strange rabid wolf or dog like creature with gray fur.
- This movie portrays the Chupacabra as a Mexican legend in origin; however this is not accurate since the Chupacabra has its origins in Puerto Rico. It should be noted, however, that most of these mistakes were made by the ignorant American villains. They chose how their monster costume would look. Although the villagers had noticed the discrepancy.
- Velma incorrectly states that Teotihuacan (the pyramid complex where the gang emerges after following a secret passage from the Museum of Anthropology) was built by the Olmec civilization. Teotihuacan is thought to have been established around 200 BCE, in the highlands of Central Mexico, near Mexico City. The Olmec civilization flourished from 1500 BCE to 400 BCE in the Gulf Lowlands to the east and south.
In other languages
|Greek||Scooby-Doo! και το Τέρας του Μεξικού||Scooby-Doo! and the Monster of Mexico|