Distributia
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Dee Bradley BakerEntity Three / Astronaut (voice)
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Gregg BergerChattering Teeth / Puggle / Student #2 (voice)
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Greg EaglesGrim
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Tara StrongGirl / Student #3 (voice)
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Grey GriffinMandy
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Jonny ReesEntity Two / Another Astronaut (voice) (as Greg Ellis)
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Jennifer HaleBilly's Mom
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Richard Steven HorvitzBilly
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John KassirLord Moldybutt
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Tom KennyTV Man (voice)
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Vanessa MarshallIrwin
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Roger RoseFarmer / Student #1 (voice)
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Ronnie SchellToadblatt
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Jake ThomasNigel Planter
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Frank WelkerGeneral / Hideous Monster / Entity One (voice)