- Otis as Gumby
- Eddy, Igg, and Bud as Professor Kapp, Nobuckle, and Lowbelly
- Snotty Boy as Lucky Claybert
- Mrs. Beady as Tara
- Daisy as Goo
- Maddy as Gumby's Mum
- Pip as Pokey
- Pig as Gumby's Dad
- Freddy and Duke as The Blockheads
- and more
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