Casey Kasem

(voices)

E. G. Daily

Buttercup (Voice)

Mae Whitman

Little Suzy (Voice)

Tara Strong

Bubbles (Voice)

Jeff Bennett

Jhonny Bravo (Voice)

Cathy Cavadini

Blossom (Voice)

Christine Cavanaugh

Dexter (Voice)

Charlie Adler

I.R. Baboon (Voice) / Cow (Voice) / Chicken (Voice) / Red Guy (Voice)

Richard Steven Horvitz

Billy (Voice)

Grey DeLisle

Mandy (Voice)

Brenda Vaccaro

Bunny Bravo (Voice)

Greg Eagles

The Grim Reaper (Voice)

Tom Kane

Professor Utonium (Voice)

Tom Kenny

The Mayor (Voice)

Charlie Adler

I.R. Baboon

Michael Dorn

I.M. Weasel (Voice)

Marty Grabstein

Courage (Voice)

Thea White

Muriel Bagge

Thea White

Muriel Bagge (Voice)

Allison Moore

Dee Dee (voice)

Frank Welker

(voices)

Mindy Cohn

(voice)

Jim Cummings

(voice)

Mark Hamill

(voices)

William Hanna

(voice)

Joseph Barbera

(voice)

Ted Turner

(archive footage)

Don Messick

(archive footage)