Scooby-Doo on Zombie Island is a 1998 direct-to-video animated comedy horror film based on Hanna-Barbera's Scooby-Doo Saturday-morning cartoons. In the film, Scooby-Doo, Shaggy, Velma, Daphne and Fred reunite after a year-long hiatus from Mystery, Inc. to investigate a bayou island said to be haunted by the ghost of the pirate Morgan Moonscar. However, the five find not only a deeper mystery on the island, but their first encounter with a genuine, deadly supernatural threat. It is the first in a long-running series of direct-to-video Scooby-Doo films; succeeded by Scooby-Doo! and the Witch's Ghost (1999). Production started at Hanna-Barbera, but was then completed by its then-new parent company, Warner Bros. Animation (which would produce all subsequent Scooby-Doo films). It was also the first of four Scooby-Doo direct-to-video films to be animated overseas by Japanese animation studio Mook Animation.
The film was released direct-to-video on September 22, 1998 and premiered on Cartoon Network on October 31, 1998. The film received acclaim from critics who praised the animation, voices and writing. The film also has a much darker tone than the original series. Unlike in the original series, promotional commercials for the movie announced that "This time, the monsters are real!"
The movie was dedicated to the memory of Don Messick, the original voice of Scooby-Doo, who died nearly a year before the film's release. The movie is also one of Ed Gilbert's final roles.