Dexter Riley
Dean Higgins
Harriet Crumply
A.J. Arno
Kirwood Krinkle
V.P. Harry Crumply
Regent Dietz
Richard Schuyler
Cookie (as Dick Bakalyan)
Prof. Quigley
Ah Fong
Chief Blair
Debbie - Student
Gilbert - Student
Cris - Student
Peter 'Porky' Peterson
Slither Roth
Melissa (Student)
John - Student
Hector - Student
Matthew - Student
Pat - Student
David - Student (as David Richard Ellis)
Larry - Student
Mr. Roberts
Uncle Frederick
Referee
Regent Burns
Mr. Roscoe
Cousin Edward (as James E. Brodhead)
Mr. Secretary
Irwin
Roger
Jack
Larry
Eric
TV Announcer
Officer Hurley
Mr. Becker
Mr. Parsons
Mr. Lufkin
Mr. Reedy
Mercedes
Mr. Willoughby
Mr. Rogers
Mr. Slate
Mr. Webster
Regent Appleby
Regent Shaw
Policeman
Pete
Professor
TV Color Man
Reporter (as Pete Renoudet)
State Coach
Drummer
TV Man
Crumply Crunch Executive (uncredited)
Regent (uncredited)
Elmer - Student (uncredited)
Driving Cop (uncredited)
Krinkle Krunch Executive (uncredited)
School Security Guard (uncredited)
Contest Spectator (uncredited)
Technician (uncredited)
Executive (uncredited)
Committee Member (uncredited)