- Henry Corden
- Additional Voices
- Joan Gerber
- Additional Voices
- Nicole Jaffe
- Velma Dinkley
- Casey Kasem
- Shaggy Rogers / Robin (Dick Grayson)
- Ted Knight
- The Penguin
- Julie McWhirter
- Additional Voices
- Don Messick
- Scooby-Doo / Professor (archive footage)
- Heather North
- Daphne Blake
- Olan Soule
- Batman / Bruce Wayne (archive footage)
- Larry Storch
- The Joker
