The evil 21 leaves, with her good counterpart, 18, and 17 resolving to stop her in reminiscence of their fallen good friend, Android 16. As the sport progresses, 17 notices something unusual about the new android, who was continuously groaning and screaming, at one point 17 even saying he disliked her tone. However, when discovering Krillin, who was trying to rescue 18, 21 lastly snapped and advised about “eating” him which stunned 17. Luckily, the group managed to subdue Krillin and 21, with 17 having to move Krillin’s body someplace. After this incident, 17 and 18 demand a proof from 16 and return to 21’s lab, the place it is revealed by 16 that Android 21 was a human converted into a Bio-Android from the cells of assorted fighters and scientists.
sixteen states they planned to make use of the soul link system developed by Dr. Gero to suppress the evil 21. Android 21 recreated sixteen due to him being designed after her human son and would have lived peacefully with him had it not been for her cravings and growing evil persona. Goku’s final want of Shenron after the battle with Syn Shenron restored the lives of those that did not should die between the Super 17 and the Shadow Dragon Sagas, together with Android 17.
Pan’s ploy to have Gero convey 17 to a halt is ruined when Dr. Myuu reveals his programming positioned him in full control of the super android, and so Super 17 kills Dr. Gero, for the second time. Piccolo and Dende create a gateway between Hell and Earth, allowing Goku to escape and confront Super 17, before any other Z Fighters may be killed.
However some of the cells (implied to be these of Kid Buu as his clones share the unique’s personality) went uncontrolled inflicting Android 21 to develop cravings to turn people into food to consume and absorb their energy like Cell and Majin Buu. This triggered 21 to develop an evil split personality which is vying for management of Android 21’s physique.
As a result, 17, 18, and Good 21 be a part of forces with the Z Fighters to combat 21 and the clones which she begins feeding on to satisfy her growing starvation. The Good 21 in the end sacrifices herself to make sure her evil counterpart both are destroyed by Goku’s Spirit Bomb, to prevent herself from being ultimately being overcome by her cravings and turning on her newfound pals as she had with 16. When Goku tells his pals not to fear they’re afraid he plans to revive 21 with the Dragon Balls but he notes that may fly in the face of 21’s sacrifice and that he as a substitute plans to ask King Yemma reincarnate 21’s soul like he had done previously with Kid Buu’s. Wanting to guard her fellow Androids, 21 transforms right into a blue-eyed model of her true type with the help the soul hyperlink.
She manages to defeat Cell, however her cravings and evil persona take management and he or she destroys sixteen when he tries to stop her from eating Cell. They handle to help 21 come to her senses and overwhelmed with grief over having killed 16, Android 21 splits into Android 21 (Good) and Android 21 (Evil). The evil 21 inherits most of 21’s energy and eagerly consumes Cell causing her skin to alter shade and achieve patches on her skin much like Cell’s spots.