Waluigi gets a mission from the Yoshi Ruler to stop Kremling activity near the volcano. He goes there and fight all the Kremlings and Kaptain K. Rool, who are drilling into the volcano. The Kremlings retreat and Waluigi heads back to the Yoshis. Later, the Kremlings return and discover the Behemoth Wand and summons the Mushroom Behemoth, who proceeds to squash them and the whole island.
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