This is the emotional final episode of Dragon Ball Kai. It features Trunks going back to his time in the future and using his newfound power to defeat the Androids and Cell. Also, we see highlights of the heroic life of Goku, who has passed away.
The Saiyans have reached the planet and have encountered the fighters of Earth. However, instead of a direct confrontation, the foes unleash the Saibaimen, cultivated life-forms, on the fighters.