The Spacemen Fleet was a fleet of space warships that served as part of the Spacemen military. The Spacemen sent their space navy to Earth, so that they could conquer the planet. They are stopped by Superboy and Krypto however, who deflect missiles fired at Earth back at the ships, destroying them. Considering that the pilots and other personnel on the fleet ships were all enhanced by Kryptonian energy, giving them all of Superboy's super powers, it is likely they survived the explosions of the ships, and retreated back to the Spacemen Homeworld.