• Henry as Mike
  • Daddo as James
  • Summer as Boo
  • Mr. Growl as Mr. Watermoose
  • Monstertroll as Randall
  • Milo as Fungus
  • Mimi Monstermouth as Roz
  • Gertie as Celia Mae
  • Denzel and Fergus as Needleman and Smitty
  • Mrs. Growlberg as Flant
  • Oscar as Bile
  • Signor Roartonto as Jerry
  • Roberto as Claws
  • Hunter as Lanky
  • Harry as George
  • Roy as Charlie
  • Mini-Monsters as CDA
  • Eduardo as Ted
  • Captain Hollander as The Chef
  • Isabella Roarson as Mrs. Nesbit
  • Roddy as Baby Smitty
  • Irving as The Yeti

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