In an alternate timeline, two years after defeating Frieza and King Cold, Goku succumbs to a viral heart disease. Goku's death, being the result of natural causes, means that he can no longer be revived with the Dragon Balls. Six months later, Piccolo, Vegeta, Krillin, Tien Shinhan, Yamcha, and Chiaotzu are killed by Android 17 and Android 18. With the death of Piccolo, Earth's guardian, Kami, dies as well and the Dragon Balls are rendered permanently useless - making it impossible for anyone to be revived.