Gyro's Clones are a number of clones of Gyro Gearloose.
Gyro began creating his clones sometime before Louie stole his Time Tub. He would later employ them to help repel General Lunaris's attempt to have the Moonlanders invade the Earth. At least two versions of Gyro were killed during the events, but while the first one was definitely a clone, the clones were all so identical to the original that even they couldn't know for sure if the second Gyro to be destroyed had been a clone or the original. This hardly mattered, as they all had identical memories.