Scooby-Doo on Zombie Island sequences of interplay between Shaggy and Scooby for him. After Don Messick's death, Scott Innes replaced Messick as the voice of Scooby-Doo. Casey Kasem did not reprise his role as Shaggy Rogers as he wished to only voice Shaggy if the character became a vegetarian, like himself. Instead, Billy West provided the voice for Shaggy. Mary Kay Bergman was cast as Daphne when the character was taken in a new direction. B.J. Ward, who played Velma in the "Johnny Bravo" crossover episode, reprised her role in this film. Frank Welker is the only actor from the original series to reprise
Scooby-Doo married and retired from voice acting, Heather North assumed the role of Daphne, and would continue to voice the character until 1997. The TV influences of "I Love a Mystery" and "Dobie Gillis" were apparent in the first episodes. Of the similarities between the "Scooby-Doo" teens and the "Dobie Gillis" teens, the similarities between Shaggy and Maynard are the most noticeable; both characters share the same beatnik-style goatee, similar hairstyles, and demeanors. The core premise of "Scooby-Doo, Where are You!" was also similar to Enid Blyton's "Famous Five" books. Both series featured four youths with a dog, and the Famous