Dr.スランプ アラレちゃん んちゃ!ペンギン村はハレのち晴れ

At the Penguin Village, the dinosaurs styled monster named Dodongadon appeared. But he was small as Arale and did not have strong power. Arale defeat him very easily, and Dodongadon called his mother Mamangadon. She was huge and had a big power. How Arale can defeat this big monster?