- Jeff Bennett - Ace / Grubber / Big Billy (voice)
- Chuck McCann - The Amoeba Boys (voice)
- Phyllis Diller - Mask Scara (voice)
- Christine Cavanaugh - Bunny (voice)
- June Foray - Madame Argentina (voice)
- Greg Eagles - Sandman (voice)
- Julie Nathanson - Robin (voice)
- Julie Nathanson - Science Teacher / Schoolgirl #1 / Young Ms. Bellum (voice)
- Candi Milo - Cleaning Woman (voice)
- Candi Milo - Newswoman (voice)
- Mark Hamill - Criminal / Cop #1 (voice)
- Phil LaMarr - Bouncer / Guvn'r / Big John / Peses Bill (voice)
- Phil LaMarr - Katanga (voice)
- Don Shank - Naked Guy / Snotty Bank Teller / Man #3 (voice)
- John DiMaggio - Captain Crack McGraigen (voice)
- Dee Bradley Baker - Parrot / Reginald (voice)
- Craig McCracken
- Genndy Tartakovsky
- James L. Venable
Mark Hamill interpreta a Criminal / Cop #1 (voice) en la serie.
Cathy Cavadini hace el papel de Blossom (voice).
Tara Strong interpreta a Bubbles (voice) en la serie.
Elizabeth Daily interpreta a Buttercup (voice) en la serie.
Tom Kenny interpreta a Mayor / Snake / Lil' Arturo / Narrator (voice) en la serie.
Tom Kane interpreta a Professor Utonium / Him / Talking Dog (voice) en la serie.
Roger L. Jackson hace el papel de Mojo Jojo (voice).
Jennifer Martin interpreta a Ms. Sara Bellum (voice) en la serie.
Jennifer Hale hace el papel de Ms. Keane / Princess Morbucks / Sedusa (voice).
Jim Cummings interpreta a Fuzzy Lumpkins (voice) en la serie.
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