KSI Sentry is a fictional Transformer from Transformers: Age of Extinction. It is a mass-produced, human-built robot created by KSI, the company led by Joshua Joyce, to replicate the function and appearance of Autobots and Decepticons. The Sentries serve as security and military units, and they become part of the conflict when KSI uses Transformium and captured Transformer components to build controllable machines. Their role highlights the series’ theme of human attempts to weaponize Transformer technology.