The Earth and her people are restored through the Namekian Dragon Balls.
Gokū destroys the pure Majin Boo with a massive Genki Dama.
The Final Battle with Majin Boo was the last and major conflict of the Dragon Ball Z series. After removing Mister Boo from the body of Majin Boo. It made him undergo a metamorphis that brought the return of the Majin Boo's pure form. This conflict sets up the end of the Earth and eventual destruction of Majin Boo.