Ralph Macchio

17 Year Old Tim (voice)

Eric Idle

Evil Martin (voice)

Hynden Walch

Jenny Mcbride (voice)

Harvey Korman

Floyd (voice)

Andrea Martin

Muriel (voice)

William H. Macy

Justin (voice)

Dom DeLuise

Jeremy (voice)

Peter MacNicol

Narrator (voice)

Andrew Ducote

10 Year Old Timmy (voice)

Arthur Malet

Mr. Ages (voice)

Doris Roberts

Auntie Shrew (voice)

Phillip Van Dyke

Young Martin (voice)

Darleen Carr

Helen (voice)

Jamie Cronin

Teresa (voice)

Jameson Parker

Troy (voice)

Phillip Glasser

Reformed 19 Year old Martin (voice)

Whitney Claire Kaufman

Cynthia (voice)

Steve Mackall

Professor Valentine (voice)

Kevin Michael Richardson

Brutus (voice)

Meshach Taylor

Cecil (voice)

Debi Mae West

Mrs. Jonathan Brisby (voice)

Al Jarreau

The Balladeer (voice)

Bobbi Page

The 2nd Balladeer (voice)

Beth Andersen

Chorus (voice) (uncredited)