Thwomp Volcano is a currently inactive volcano in the southeast corner of the Mushroom Kingdom. The Mario Bros. come here in pursuit of Bowser (who has kidnapped Princess Shroob disguised as Princess Peach) during the events of Mario & Luigi: Partners in Time. The younger version of Professor Elvin Gadd used to live here prior to its annual eruption. The interior of the volcano, Thwomp Caverns, can be accessed by using Mr. Thwomp as an elevator, and deep inside the caverns, Bowser and Baby Bowser are fought.
After the Hydrogush 4000 renders the volcano inactive, the adult and baby bros journey inside after being confronted by Mr. Thwomp and Mrs. Thwomp. Mrs. Thwomp becomes outraged that the volcano became inactive and her husband loses his confidence. After the battle with Mrs. Thwomp, Mr. Thwomp agrees to help the Mario Bros. get a lift inside.
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