Scooby-Doo and his friends, Shaggy, Velma, Daphne, and Fred, are ecstatic when they win an all-expense paid trip to a luxurious resort on a tropical island. However, their excitement is short-lived when they realize that the island is none other than Moonscar Island, the same place they visited years ago and where they encountered zombies.
Scooby and his pals can't help but feel uneasy as they begin to notice strange and eerie occurrences happening around them. They quickly find out that the zombies they encountered years ago have returned, causing havoc on the island and attacking anyone in sight.
As the gang tries to solve the mystery behind the zombies, they come across various suspects who might be responsible for the attacks. Along the way, they uncover dark secrets about the island's past and its inhabitants, leading them to a shocking revelation that changes everything they thought they knew about Zombie Island.
With the help of their trusty Mystery Machine and their wits, Scooby and his friends must not only survive the zombie attacks but also uncover the truth behind the mysterious island. Will they be able to solve the mystery and put an end to the zombie invasion once and for all? Fans of Scooby-Doo can't wait to find out!