T.J. Detweiler (voice)

Vince La Salle (voice)

Spinelli (voice)

Gretchen Grundler (voice)

Mikey Blumberg (voice)

Gus Griswald (voice)

Ms. Finster / Mrs. Detweiller (voice)

Principal Peter Prickly (voice)

Digger Dave / Randall (voice)

Mikey's Singing Voice (voice)

Becky (voice)

Fenwick (voice)

Dr. Rosenthal (voice)

Dr. Phillium Benedict (voice)

Lunchlady Harriet (voice)

Lunchlady Irma / Ms. Lemon / Opera Director / Dr. Steinheimer (voice)

Cop #1 (voice)

Cop #2 (voice)

Guard #1 (voice)

Guard #2 (voice)

Counselor (voice)

Mort Chalk (voice)

Superintendent (voice)

Coach (voice)

Ashley B / Swinger Girl / Upsidedown Girl (voice)

Captain Brad Lawson (voice)

Coach Kloogie / Mr. Detweiler (voice)

Jordan (voice)

Ashley A (voice)

King Bob (voice)

Ashley Q (voice)

Digger Sam (voice)

Colonel O'Malley (voice)

Mr. Yamashiro (voice)

Bald Guy (voice)

Miss Grotke (voice)

Tech #1 (voice)

Cap'n Sticky (voice)

Dr. Lazenby / Tech #2 (voice)

Technician (voice)

Golfer #2 / Scientist #2 (voice)

Soldier Kid / Wrestler Kid (voice)

Hustler Kid (voice)

Mrs. Flo Spinelli (voice) (uncredited)