Android #16 was once a member of Dr.Gero but after cell came he had to join the z fighters. But when he fights cell, cell shots a beam blast to his head and blows of a chink of it. But yunlike the other androids Dr.gero created...this one has a soft spot at times and dose not wat to kill. After trunks and Kurrin find the instruction to make the androids, he is rebuilt along with 17 and 18, but bulma programde thease ones to ge good and fight with the z fighters. But when cell demolishes 16 and stefs on his head, it trigers somingthing in gohan...And becauses one of the greatest transformation so a super saiyan mode.