Davy
Micky
Mike
Peter
Babbit
The Big Man, Bessie Kowalski
J.J. Pontoon
George
Manny Spink
Stagehand (uncredited)
Lenny
Dr. Mann
Madame Quagmeyer
Monster
Mr. Swezey
Rob Roy Fingerhead
Groot
Mrs. Purdy
Mendoza
Jonathan
Conventioneer
Harry
Inspector Blount
Bulk
Brenda
The Sot Lance Kibee
Assistant #1
Assistant #2
Tony Ferano
Prof. Milo Schnitzler
Jeremy (Horse) (uncredited)
Monkeemobile engine (voice) (archive sound) (uncredited)
Kate
Sneak
Mrs. Weefers
Leslie Vandenberg
Gen. Harley Vandenberg
Party Guest Who's Swept off Her Feet (uncredited)
Director
Arnold
Hubbell Bensen
Bride
Watchman
Vernon
Smasher
Reporter #1
Mrs. Homer