you never saw the 10th year anniversary special of DRAGONBALL ?
it's a 1 hour movie where we see the adventure of GOKU when he was a kid. it goes from the start, where he meets bulma and goes all the way to the RED RIBBON ARMY !
i have it at home on a CD ! not the best quality but still !
ANSWER: 8thChan !
the android was the 8th one and was still a beta's as he never really got what it takes to kill. he got trown away just like the 7th others before him, but when goku cam into the base the BAD GUY had no choice but to resolve to use 8th !
but then when they fought and 8th was about to kill him... he stoped and telled to his master that it wasn't GOOD to kill ! and his master was about to selfdestruct the android when goku jumped and broke the remote control !
thus the android became friend with goku !
later when goku was about to get kill by that giant robot (last fight and goku was too dizzy) 8thChan ( go0ku named him that way) came in the way and hold the hand then got crushed by it ! that's when goku anraged and he boosted out of his anger and past thru the robot head first making him explode !
then goku wished the android back to normal with the dragonballs they had collected !
is this ringin any bell ?