Super 17

From Multiversal Omnipedia

Super 17 was an incredibly powerful android (technically, Machine Mutant) created by the fusion of Android 17 and Artificial 17. Stronger than either of his components combined on an incredible scale, Super 17 was designed to be totally loyal to Dr. Myuu- and only Myuu, as Dr. Gero found out when Super 17 destroyed him. Super 17 battled the Z Warriors, defeating them all with his fighting prowess and ability to absorb any energy attack thrown at him. Even Super Saiyan 4 Goku couldn't defeat him. However, as Super 17's power continued to grow, he grew more and more deranged, eventually turning on Myuu and destroying him. He was finally defeated by Android 18 and Goku- 18 distracted 17 with a barrage of energy blasts, allowing Goku to blast through the super-android with his Dragon Fist attack and destroy him from within.

18 believed at the end that the real 17 influenced Super 17 on some level, helping them win.