Chuck Sheetz Director Andrew Lawrence T.J. Detweiler Voice Rickey D'Shon Collins Vince Lasalle Voice Pamela Adlon Ashley Spinelli Voice Jason Davis Mikey Blumberg Voice Ashley Johnson Gretchen Grundler Voice Courtland Mead Gustavus 'Gus' P. Griswald Voice April Winchell Ms. Finster, Mrs. Detweiler Voice Dabney Coleman Principal Vance Prickly Voice Robert Goulet Mikey's Singing Voice Voice Melissa Joan Hart Becky Voice Peter MacNicol Fenwick Voice James Woods Benedict Voice Diedrich Bader Guard #2 Voice Allyce Beasley Miss Grotke Voice Gregg Berger Tech #1 Voice Klee Bragger Digger Sam Voice Clancy Brown Bald Guy Voice Dan Castellaneta Guard #1 Voice Lane Toran King Bob Voice Rachel Crane Ashley Q Voice E.G. Daily Cap'n Sticky Voice R. Lee Ermey Colonel O'Malley Voice Ron Glass Dr. Lazenby , Tech #2 Voice Tony Jay Dr. Rosenthal Voice Clyde Kusatsu Mr. Yamashiro Voice Charles Kimbrough Mort Chalk Voice Tress MacNeille Ms. Lemon , Lunchlady Irma , Opera Director , Dr. Steinheimer Voice Andrea Martin Lunchlady Harriet Voice Anndi McAfee Ashley A Voice Mark Robert Myers Technician Voice Paul Germain Creator, Producer, Writer Joe Ansolabehere Creator, Producer, Writer Stephen Swofford Producer Jonathan Greenberg Writer, Screenwriter Denis M. Hannigan Music Score Allyson Bosch Casting