Scooby-Doo and the Alien Invaders brings back the whole gang for another movie; Scooby, Shaggy, Velma, Fred, and Daphne, as they are driving across the desert in the Mystery Machine. When a sand storm hits, Shaggy makes a wrong turn into government property, and when they spot a UFO, they lose control and end up in the outskirts of a small town. The townsfolk have been reporting some strange occurrences like disappearing cows and abductions, and when Scooby and Shaggy fall asleep on a rooftop, they are abducted and wake up in a field the next morning. The team goes to work on solving the extraterrestrial case, while Scooby and Shaggy fall in love with a hippie-chick and her dog. As with every Scooby adventure, nothing is as it seems and the path to the truth always has plenty of twists.