The Imperial Class Fleet was military unit within the Imperial Zentraedi Forces. It consisted of one million Zentraedi vessels of various classes and was capable of being deployed separately from the Imperial Grand Fleet.
During the First Robotech War, Breetai asked Commander-in-Chief Dolza permission to redeploy the fleet under his command in order to deal with the Micronian threat posed by the SDF-1. With the fleet under his command, a Space Fold was initiated and the sheer number of vessels appearing before Earth created a highly visible gravimeter disturbance.