While driving back from the movies, the gang finds a strange man in the back of the Mystery Machine. They recognize it as the ghost of Mr. Hyde who is a jewel thief. They follow him to a house where they meet a descendent of Dr. Jekyll who claims to be the ghost of Hyde, but is he telling the truth?

• Joe Ruby
• Ken Spears
• Iwao Takamoto

• Frank Welker
• Alan Oppenheimer
• Hal Smith