Vince (voice)
Mikey (voice)
Gretchen (voice)
Tj (voice) (as Andy Lawrence)
Gus (voice)
Spinelli (voice) (as Pamela Segall Adlon)
Principal Prickly (voice)
Mikey's Singing Voice (voice)
Becky (voice)
Fenwick (voice)
Ms. Finster / Mrs. Detweiller (voice)
Benedict (voice)
Guard #2 (voice)
Miss Grotke (voice)
Tech #1 (voice)
Digger Sam (voice)
Bald Guy (voice)
Guard #1 (voice)
King Bob (voice)
Ashley Q (voice)
Cap'n Sticky (voice) (as E.G. Daily)
Colonel O'Malley (voice) (as Lee Ermey)
Dr. Lazenby / Tech #2 (voice)
Dr. Rosenthal (voice)
Mr. Yamashiro (voice)
Mort Chalk (voice)
Lunch Lady #2 / Opera Director / Dr. Steinheimer (voice)
Lunch lady #1 (voice)
Ashley A (voice)
Technician (voice)
Digger Dave / Randall (voice)
Golfer #2 / Scientist #2 (voice)
Jordan (voice)
Cop #2 (voice)
Golfer #1 (voice)
Soldier Kid / Wrestler Kid (voice)
Hustler Kid (voice)
Ashley B / Swinger Girl / Upsidedown Girl (voice)
Counselor (voice)
Superintendent (voice)
Coach (voice)
Cop #1 (voice) (as Nick Turturro)
Captain Brad Lawson (voice)
Coach Kloogie / Mr. Detweiler (voice)
Mrs. Flo Spinelli (voice) (uncredited)