Ep. 4: Arale und Senbei erziehen ein mysteriöses metallisches Baby namens Gatchan, das Penguin Village einen Streich spielt

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After the strange baby hatched from the egg, Arale and Senbei try to raise it. They find out that it eats metal and is powerful after it survives a long fall after Arale threw it to high on accident. Later at night in the bath, Arale and Senbei discover that it has wings. They decide to name it Gadzilla but "Gatchan" for short and then keep it as a member of the family. Gatchan wakes up early in the morning and decides to pull pranks on the residence of Penguin Village. (Source: Wikipedia)