Andrew Lawrence
T.J. Detweiler (voice)
Acting
Rickey D'Shon Collins
Vince La Salle (voice)
Acting
Pamela Adlon
Spinelli (voice)
Acting
Ashley Johnson
Gretchen Grundler (voice)
Acting
Jason Davis
Mikey Blumberg (voice)
Acting
Courtland Mead
Gus Griswald (voice)
Acting
April Winchell
Ms. Finster / Mrs. Detweiller (voice)
Acting
Dabney Coleman
Principal Peter Prickly (voice)
Acting
Ryan O'Donohue
Digger Dave / Randall (voice)
Acting
Robert Goulet
Mikey's Singing Voice (voice)
Acting
Melissa Joan Hart
Becky (voice)
Acting
Peter MacNicol
Fenwick (voice)
Acting
Tony Jay
Dr. Rosenthal (voice)
Acting
James Woods
Dr. Phillium Benedict (voice)
Acting
Andrea Martin
Lunchlady Harriet (voice)
Acting
Tress MacNeille
Lunchlady Irma / Ms. Lemon / Opera Director / Dr. Steinheimer (voice)
Acting
Nicholas Turturro
Cop #1 (voice)
Acting
Kevin Michael Richardson
Cop #2 (voice)
Acting
Dan Castellaneta
Guard #1 (voice)
Acting
Diedrich Bader
Guard #2 (voice)
Acting
Kath Soucie
Counselor (voice)
Acting
Charles Kimbrough
Mort Chalk (voice)
Acting
Robert Stack
Superintendent (voice)
Acting
Ken Swofford
Coach (voice)
Acting
Francesca Marie Smith
Ashley B / Swinger Girl / Upsidedown Girl (voice)
Acting
Erik von Detten
Captain Brad Lawson (voice)
Acting
Paul Willson
Coach Kloogie / Mr. Detweiler (voice)
Acting
Patrick Renna
Jordan (voice)
Acting
Anndi McAfee
Ashley A (voice)
Acting
Lane Toran
King Bob (voice)
Acting
Rachel Crane
Ashley Q (voice)
Acting
Klee Bragger
Digger Sam (voice)
Acting
R. Lee Ermey
Colonel O'Malley (voice)
Acting
Clyde Kusatsu
Mr. Yamashiro (voice)
Acting
Clancy Brown
Bald Guy (voice)
Acting
Allyce Beasley
Miss Grotke (voice)
Acting
Gregg Berger
Tech #1 (voice)
Acting
E. G. Daily
Cap'n Sticky (voice)
Acting
Ron Glass
Dr. Lazenby / Tech #2 (voice)
Acting
Mark Robert Myers
Technician (voice)
Acting
Phil Proctor
Golfer #2 / Scientist #2 (voice)
Acting
Justin Shenkarow
Soldier Kid / Wrestler Kid (voice)
Acting
Michael Shulman
Hustler Kid (voice)
Acting
Katey Sagal
Mrs. Flo Spinelli (voice) (uncredited)
Acting