In Paper Mario, the Star Rod is a magical object that grants the wishes of whoever wields it. Bowser is intrigued by its ability in the game, and and steals it in the beginning of the title. He also imprisons the Star Spirits. He defeats Mario in the beginning of the title and roots Princess Peach's Castle right from the ground and into the air far above the Mushroom Kingdom. With the help of the seven star spirits Mario manages to defeat Bowser despite being invincible thus ending the game.