Scooby-Doo and the Alien Invaders

Shaggy, driving the Mystery Machine through a desert sandstorm, accidentally steers onto government property. A UFO sighting accompanies the disruption, and the van crashes near a small town. With the crash, the team disperses and Shaggy and Scooby stay with the Mystery Machine while the others head into town for help.

The rest of Mystery Inc. moves into the town to seek assistance while Shaggy and Scooby remain by the van. They encounter locals who hint at strange activity without offering concrete answers. The group's plan shifts toward regrouping in town and pursuing clues.

As night approaches, a group of aliens pursues Shaggy and Scooby into the town. The duo ducks into the diner to hide, hoping the rest of the gang will catch up. The chase reveals the seriousness of the visitors and raises the stakes for everyone.

The gang reunites at the diner, where waitress Dottie explains locals have not seen aliens, though they report strange lights and sounds at night. This discrepancy fuels the mystery and pushes the friends to investigate further. The diner's atmosphere hints that not all is as it seems.

Chef Sergio reports cattle vanishing overnight, amplifying fear and prompting some residents to flee the town. The disappearance adds weight to the alien rumors and deepens the town's paranoia. The mystery deepens as no clear explanation emerges.

A patron claims to have pictures of aliens, but the gang discovers the so-called evidence is only paintings. He offers the visitors a place to stay for the night, trying to come across as helpful while hiding something. The encounter adds another layer of misdirection to the investigation.

While the group sleeps on the diner roof, the aliens abduct Shaggy and Scooby and take them into the desert. They wake up separated from their friends, setting up a rescue mission for the rest of the gang. The abduction marks a turning point in the story.

Crystal and her dog Amber reveal themselves and rescue Shaggy and Scooby, driving them back to the diner. Crystal claims she is an undercover government agent investigating alien activity. The rescue crucially reconnects the team and broadens the scope of the mystery.

Crystal leads Shaggy to the caves where the original encounter occurred, and they discover gold deposits. They are chased by aliens and military police, hinting at a hidden agenda behind the sightings. The cave visit confirms a deeper mystery tied to a mine.

The gang enlists Buck to fix the Mystery Machine. Buck introduces Max and his SALF team, including Laura and Steve, who reveal their broader alien-life research aims. The introductions set up a scientific backdrop to the strange events.

Velma spots dried mud on the SALF boots, fueling her suspicions about their true motives. In a canyon, the group uncovers a dry riverbed, mining equipment, and gold hidden in several caves, confirming a complex mining operation. The tension between groups escalates as clues multiply.

The aliens reveal themselves as the SALF team, who discovered the cave is part of a 19th-century gold mine on government property. They kept it hidden, using alien disguises to deter others and hiring MPs to impersonate authorities. The ruse explains the mining activity and the faux alien sightings.

The MPs corner Shaggy, Scooby, Crystal, and Amber, but Crystal and Amber reveal themselves as aliens to rescue their friends and subdue the SALF team. They also disclose their role in causing Shaggy's crash and used retro TV signals to disguise themselves before departing Earth. The confrontation ends with the primary threat neutralized.

With the impostors arrested and Buck repairing the Mystery Machine, Mystery Inc. resumes its journey. Crystal and Amber depart Earth, leaving the team to continue their adventures with the case officially closed. The road ahead remains uncertain, but the gang stays united.