: Features the primary voice cast, including Mindy Cohn as Velma and Frank Welker as Fred/Scooby.

The gang eventually uncovers a plot by and his group of radical environmentalists. Dressed as "Fish Freaks," they plan to trigger a massive oil spill to destroy the environment as a way to "save it" by proving its vulnerability. Key Revelations

: It is often praised for its "creepy mystery" and the emotional depth given to Velma's character.

: Amy is revealed to be the wife of Dr. Spike Cavenaugh, Destroido’s former chief of geology. She manipulated Velma into helping her rescue her husband, who had been kidnapped by the Fish Freaks.