Scooby-Doo! and the Monster of Mexico

Fred Jones and the gang accept Alejo's invitation and travel to Veracruz to visit him and his family. They check into the Otero family's struggling hotel and meet Alejo's wife Sofia, son Jorge, and the rest of the household. Rumors of a monster called El Chupacabra begin to swirl as they settle in.

Over dinner, the Otero family discusses how El Chupacabra is scaring away potential customers. Diego Fuente, business partner of Alejo and Luis's deceased father, arrives hoping to buy the hotel, but the Oteros refuse. The Mystery Inc. team agrees to take on the case and help the family.

Fred leads the investigation with Velma, Daphne, and the Otero brothers, while Shaggy and Scooby stay behind with the Mystery Machine. They notice a threat message painted on the van warning them to stop, but continue anyway. The group splits up to cover more ground, moving deeper into the surrounding woods.

In the woods, Fred, Velma, and Daphne encounter El Curandero, a medicine man who cautions them that danger is imminent and urges them to study history to understand the monster. He hints at a deeper conspiracy rather than a single creature. The warning adds urgency to their investigation.

El Chupacabra attacks the Otero brothers while they search for clues. Shaggy and Scooby, still with the Mystery Machine, realize their brakes have been drained, leaving them with a precarious ride. They manage to reconnect with the others and head toward a gas station for repairs.

The team visits a local history museum hoping to find information about the area's past. A hyperactive museum guide leads them into a lively performance about ancient Mexican customs. During the chaos, Daphne is forcibly volunteered and then kidnapped.

They discover a secret passage in the museum that leads to Aztec pyramids. The group follows it and finds Daphne, but are chased by amused tourists who are led by an animatronic eagle that seems to protect the site. They narrowly escape and return to the surface.

Back in Veracruz, the gang reviews clues from the museum and Alejo's case files, noting a grammatical error in a threatening note that a native Spanish speaker would never make. The discrepancy makes them suspect misdirection or disguise.

On Day of the Dead, Dolores tells them Charlene has been kidnapped by El Chupacabra. The Oteros prepare offerings to honor Alejo and Luis's father and hope for Charlene's safe return, while a ghostly visitation prompts them to sell the hotel. The emotional stakes rise as the mystery deepens.

Fred discovers a good luck charm Charlene gave Luis is actually a tracking device, and he activates it. Scooby and Chiquita follow the beeping signal to a shed where a man in a skeleton costume seems to control the ghostly illusion.

The team captures the man and uncovers him as Mr. Smiley, a theme park owner who manipulated the Chupacabra scare to drive business to his park and ruin the local competition. They piece together how the scheme was designed to manipulate Veracruz's economy.

Before they can close the case, El Chupacabra attacks again. The team ensnares the creature and unmasks it as the tour guide, who reveals she was Charlene in disguise. The deception is tied to the larger plot against the town.

Alejo's associate Fuente arrives and explains that he knew about Smiley and Charlene's plot and had tried to warn the Oteros and Mystery Inc. The revelation confirms how far the scheme extended and why they fought to protect the hotel.

Smiley and Charlene are arrested, and Mystery Inc. along with the Otero family celebrate the Day of the Dead. The town begins to recover from the fear-spreading scheme as order is restored and the Case is closed.