As Alvin struggles with nightmares involving werewolves, the school play of Jekyll & Hyde is in jeopardy when the lead, Alvin, is suspended. In an attempt to boost his confidence, the principal suggests Theodore, who's suddenly going through some canine changes.

• Bagdasarian Productions
• Universal Cartoon Studios
• Ross Bagdasarian, Jr.
• Janice Karman
• Maurice LaMarche
• Miriam Flynn
• Rob Paulsen
• April Winchell
• Elizabeth Daily
• Frank Welker