Sinistron was designed and created by Will Magnus to be the ultimate sentinel. The hatred that Will Magnus had for his brother, Magneto, was encoded into Sinistron's synthetic mind along with the seeds on sentience that allowed Sinistron to overcome his programming and rebel against his master. Seeing the potential mutants had for destruction, Sinistron began to capture mutants and bring them back to his citadel on Genosha where he would control their minds to turn them into an army to conquer the world.
This got the attention of Magneto and his Magnetic Men. Sinistron escaped their first battle, but was tracked back to Genosha were he was ready to face his pursuers again. Magneto tried to disable Sinistron's electronic mind with an electromagnetic attack, but had his own mind frozen when Sinistron reversed the attack on him. This allowed the Magnetic Men to break free of Magneto's control, which froze them when his mind was frozen, and attack Sinistron and break his hold on Magneto. Magneto continues his assault and destroys Sinistron's body, but he escapes again this time in a miniature drone that contained his consciousness.
Powers and abilities
Sinistron's abilities include superhuman strength and durability, the power of flight, and various offensive weapons such as concussion blasters, radiation emitters and his "encephalo-ray", which plunges its victims into a deathlike coma. The latter ray also allows Sinistron to mesmerize and outright mind-control his victims, or implant subliminal hypnotic commands within their minds to be enacted at a later time. Sinistron's outer shell is composed of Adamantium, rendering it almost totally impervious to damage. Among his features are tractor beams and energy absorption capabilities.
Sinistron incorporates a "program transmitter" which can beam part or all of Sinistron's programming into remote locations such as computers or alternate robotic bodies. Sinistron can control other machines remotely even if he has not transplanted his consciousness into them. Sinistron is one of the foremost robotics experts on Earth.