Scooby-Doo! and the Monster of Mexico is a 2003 American direct-to-video animated adventure film; the sixth in a series of direct-to-video films based upon the Scooby-Doo Saturday morning cartoons. It was released on September 30, 2003, and it was produced by Warner Bros. Animation.
It is the second and final film (after Scooby-Doo! and the Legend of the Vampire) to briefly reunite the surviving or available voice cast from the original 1969 series, with Frank Welker voicing Scooby-Doo in place of the late Don Messick. The film also marks the last time Nicole Jaffe and Heather North voice Velma and Daphne, respectively, before North's death on November 29, 2017.
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Plot
Fred Jones' pen pal, Alejo Otero, invites him and Mystery Inc. to visit him and his family in Veracruz, Mexico, which is being terrorized by a monster that its citizens believe to be "El Chupacabra".
Upon their arrival, Mystery Inc. stay at the Otero family's struggling hotel and meet his wife Sofia, son Jorge, mother Doña Dolores, brother Luis, and Luis's American fiancée, Charlene. Over dinner, the Oteros are met by Diego Fuente, a business partner of Alejo and Luis's deceased father who wants to buy the hotel, but the Oteros refuse and send him off. Alejo later tells Mystery Inc. that El Chupacabra has been scaring potential patrons away.
Taking the case, Fred leads Mystery Inc. and the Otero brothers in searching for the monster. Despite finding a message written in Spanish on the gang's van, the Mystery Machine, warning them to stop investigating, the group continue, with Fred, Velma Dinkley, Daphne Blake, and the Otero brothers splitting up while Shaggy Rogers and his dog Scooby-Doo stay with the Mystery Machine, unaware that someone drained their brake fluid. While searching the woods, Fred, Velma, and Daphne encounter El Curandero, a medicine man, who tells them to research history and warns them that they are in grave danger while the Oteros are attacked by El Chupacabra. Despite lacking brakes, Shaggy and Scooby use the Mystery Machine to reunite with the others and save them from the monster before reaching a gas station.
