Dr. Monster is a criminal in Dr. Slump that lives in Penguin Village that is a big fan with giant monsters like Godzilla and Gamera. He wanted to buy an expensive Monster Encyclopedia and decided to kidnap Arale to get ransom money. He lures Arale to his hideout (King Gidora Mansion which is a reference to the moster King Gidorah) with a turtle on a string saying it is Gamera. Awhile after Senbei finds Arale she writes to him sending him a lizard saying it is a baby Godzilla and that oneday she wants her Gamera to fight his Godzilla.

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