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Curtis Armstrong
Robot DeFault / Marf (voice)

Harland Williams
Monster Krumholtz (voice)

Maurice LaMarche
Gart / Perry / Loudmouth (voice)

Jonathan Slavin
Ogo (voice)

Megan Hilty
J.D. (voice)

Cree Summer
Spitfire / Globitha (voice)

Rhea Perlman
Nessie (voice)

Fred Tatasciore
Punch Morley (voice)

Kurtwood Smith
Mr. Wheelie (voice)

Ping Wu
Master Grabmirist (voice)

Nolan North
Hal Worth-a-ton / Uncle Kuffley / Crikey (voice)