After his allies #14 and #15 are killed in combat, he absorbed the remaining pieces to become Super Android 13 and it seemed all luck had run out as he now seems invincible and none of the Z Fighters couldn't hurt him. He hurts and nearly kills them all.
Goku challenges him one last time by performing a Spirit Bomb (Genkidama in Japan) but in that moment 13 is manhandling Vegeta then Trunks distracted 13 and told him "My name is Trunk! I came here from 20 years from the future.... you know what's funny about the future? you are nowhere to be seen, you are not in the future because you die right here and now today!!" then trunks attacked 13 as a Super Saiyan so android 13 just encountered back and knocked out trunks. After Super android 13 sees Goku almost finishing the Spirit Bomb he told Goku "I know all about your Spirit Bomb Goku and you need more time which is something you don't have!!" then he tries to deliver an S.S. Deadly Bomber then out of nowhere Piccolo from behind grabbed 13 and prevent the S.S. Deadly Bomber from hitting Goku so 13 got mad and started to manhandle Piccolo. At the end Goku is Finished and transforms into a Super Saiyan and Absorbs the Spirit Bomb and gets close to Super Android 13 so 13 hits Goku and his hands started to disintegrate so Goku punches 13 in the chest so hard the his punch went through and end up killing him for good and everything was over.

Goku kills Super Android 13
Powers and Abilities
As an Android, #13 possess far greater strength, speed and stamina than most beings in the Dragonball Franchise. His robot
physiology gives him.
- Superhuman Strength
- Superhuman Speed
- Infinite Stamina Supply
- Superhuman Durability
- Flight
- Energy Projection
- Infinite Energy Supply
- Scouters
- Fusion
- Link with Super Computer