Scooby-Doo on Zombie Island (1998)

The Mystery Inc. gang embarks on one of their most chilling and supernatural adventures and finds them retired from solving mysteries. However, they all come together again and travel to a mysterious haunted island inhabited by zombies and ghosts. Although they initially disbelieve they are real, their skepticism is soon to be shattered. This was the first Scooby Doo movie released for sale and features a darker, more mature tone than later releases, something that revived the franchise's popularity.