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.
Ross Bagdasarian, Jr.
as Alvin Seville / Simon Seville / Dave Seville (voice)
Janice Karman
as Theodore / Brittany / Jeanette / Eleanor (voice)
Maurice LaMarche
as Mr. Lawrence Talbot (voice)
Miriam Flynn
as Principal Milliken (voice)
Rob Paulsen
as Mr. Rochelle (voice)
April Winchell
as Madame Raya (voice)
E. G. Daily
as Nathan (voice)
Frank Welker
as Werewolf Vocal Effects (voice)
