Some autobots are captured. The remaining Autobots team up with some rebels to free their friends, the rebels know all the weaknesses of their enemies machines. They merge with the Autobots to become Headmasters to free their friends.
“信号塔大战”后,熊大、熊二和光头强的缩小器再度遗失。三人组合继续留守不夜城,找寻缩小器的回家之路更是状况频出,但他们从未放弃希望,最终与小动物们合力拯救小镇,呈现了一场精彩惊险的微观世界冒险之旅。