Robot DeFault / Marf (voice)

Monster Krumholtz (voice)

Gart / Perry / Loudmouth (voice)

Ogo (voice)

J.D. (voice)

Spitfire / Globitha (voice)

Nessie (voice)

Punch Morley (voice)

Mr. Wheelie (voice)

Master Grabmirist (voice)

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

Snap Winsome / Lil' Lugnuts (voice)

Snap Winsome (voice)

Marf (speaking) / Snap Winsome (voice)

Arpa / Grandma 10010 (voice)

Lucy (voice)

Crazy Cousin Gizmo (voice)

Lev (voice)

Dame Lady Madame (voice)

Sir Cranklin (voice)

Bob / Scale (voice)

St. Crispy (voice)

Monster's Singing Voice (voice)

Robo Ono (voice)

Vapid Milquetoast (voice)

Bea Holder (voice)

Fuzzy Slippers (voice)