Super 17

Super 17 is a fusion of Android 17 and his counterpart Hell Fighter 17. He is the second of the three arch-villains in Dragon Ball GT and the main antagonist of the Super 17 Saga.

In the depths of Hell, Dr. Gero, who created the deadly androids, and Dr. Myuu, who created the Machine Mutants, including Baby, collaborated. They sought to make the ultimate fighter and planned to merge Android 17 with a Machine Mutant of their creation, making the ultimate machine killer. Gero and Myuu built Hell Fighter 17, who brainwashed 17, then had them both combine their energies to create a portal out of Hell. This the two doctors, along with a great deal of other previously defeated villains, escape. 17 proceeded to try and get Android 18 to join them, but Krillin interfered and 17 blasted him to death without a second thought. Enraged, 18 attacked him, but he didn’t fall so easily and tried to kill her as well, though he eventually left to met up with Hell Fighter 17. The two managed to meet up as Hell Fighter 17 was fighting Vegeta and the two fused into one, becoming Super 17.