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The Piranha Bean is one of the bosses in Mario & Luigi: Superstar Saga found near Beanbean Castle Town. It must be fought so the Mario Bros. could get a bean fruit which would get them the Beanstar piece in the Yoshi Theater, and Luigi must be separated from Mario to find it. While looking for Bean Fruits, Luigi found out that one of those had been swallowed by the Piranha Bean, and had to fight the irate plant so as to get it back.
During the battle, the Piranha Bean shoots small fireballs at the plumber. The boss can attack from various spots on the battlefield, which makes his attacks slightly harder to dodge. After the end, Luigi discovers that Prince Peasley too was swallowed by the Piranha Bean, and was shrunk to a very small size (the Piranha Bean itself sometimes uses the prince as a projectile during battle).
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