- Robyn Starling as Susan Murphy/Ginormica
- Top Cat as B.O.B.
- Tom the Cat as Dr.Cockrouch
- Timmy Brisby as The Missing Link
- Droopy the Dog as Incentosaurus/Butterflyasaurus
- Captain Hook as Gallaxhar
- Captain Hook's Pirates as Gallaxhar's Clones
- Mister Smee as Gallaxhar's Computer
- Rex as General Warren R. Monger
- Mr.Paul as President Hathaway
- Tyler as Derek Dietl
- Carl as Carl Murphy
- Wendy as Wendy Murphy
- Lola as Katie
- Alvin as Cuthbert
- Flint Lockwood as News Reporter
- Pacha as Newsreader
- Monster House as Robot Probe
- Alleycats as Other Robot Probes
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