Ep. 13: The Terrifying Good Girl

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Dr. Slump chastises Arale for her antics. Arale's old acquaintance, Thief-San finds himself dragged into the house, but Arale helps him steal the household inventions, to Slump's chagrin. Still determined to prove that she is a good girl she takes Yamabuki's lesson with such enthusiasm, that she terrifies the animals of Penguin Village and puts the police through a lot of trouble. (Source: Wikipedia)