- Barney as B.O.B.
- Moe as Missing Link
- Lenny as Dr.Cockroach
- Marge as Susan Murphy
- Mothra(from Godzilla) as Insectosaurus
- Rainier Wolfcastle as General W.R. Monger
- Sideshow Bob as Gallaxhar
- Homer as Derek
- Kent Brockman as President Hathaway
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