Scooby-Doo and the Alien Invaders four Scooby-Doo direct-to-video films to be animated overseas by Japanese animation studio Mook Animation. It was the last film to feature Mary Kay Bergman as the voice of Daphne before her death in November 1999 and the film was dedicated to her memory. The Mystery Machine is driving through a desert in Roswell, New Mexico. A sandstorm comes up and Shaggy Rogers makes a wrong turn onto government property. Seeing a UFO causes Shaggy to lose control of the vehicle and the gang find themselves on the outskirts of a small town. While Scooby-Doo and Shaggy stay with the van,
Scooby-Doo in 1997 and Casey Kasem, a strict vegetarian, relinquished the role of Shaggy after having to provide the voice for a 1995 Burger King commercial. Therefore, Scott Innes took over as both Scooby-Doo and Shaggy (Billy West voiced Shaggy in "Scooby-Doo on Zombie Island"). B.J. Ward took over as Velma, and Mary Kay Bergman voiced Daphne until her death in November 1999, and was replaced by Grey DeLisle. These first four direct-to-video films differed from the original series format by placing the characters in plots with a darker tone and pitting them against actual supernatural forces. "Scooby-Doo on Zombie Island",