Wilhelm the Tinkerer
Roy Preston
Self (archive footage)
Mort Cohen
Georgy Malenkov
Big Nose (voice)
Francis Silverberg
King Peppy (voice)
Bill Shurmur
Snowman (voice)
Sid Garner
David Bryant
Bruce Cutler
Bob Gibbons
Mr. Solomon
Carl Murphy (voice)
Danny
Gordon Blythe
Detective Waylon
Mr. Gremmins
Sid Garner
Vigman
Adam Shadowchild
Big Nose Thug (voice)
Mr. Calvin Curdles (voice)
Harris Chappell
Anthony James
Sid Garner
Carl Murphy (voice)
Carl Murphy (voice)
Tom Manning
Dr. Whitby
Santa Claus (voice)
Hank Kingsley
Geek / Jeffrey / Dr. Geekman
King Neptune (voice)
Crane
Tom Manning
Scott's Dad (uncredited)
Mr. Salomone
Bank Employer
Dr. Feldman
Mr. Salomone
Mitchell
Christopher
Mayor Augustus Maywho
Clem Greenberg
Dr. Potts
Jack Boomer
Coach 'Spanky' Wenchell
K. Edgar Singer
Quince
Dr. Fish
Alan Blanchard
Isser Harel
Art Lundstrum
Maury Garner
Walt Whalen Jr.
Bernie Abbot
Dr. Zin
Willie
Gerald Webber
Uncle Alby
Dr. Leo Krutz
Vance Crasswell
Peter LaPorte
Mr. Larry Marks
Peter (voice)
Vladimir
Mr. Rice
Eli (voice)
Jerry
Dr. Lindsey
Professor Michael Silver
Boris Potemkin
Mort Broome
Jinx
Alden Pepper
Jeffrey Bauman
Waldemar
Harry Lanson
Lance Kessler
Jay Porter
