Not to be confused with Cloud City, a similar edifice on planet Bespin.
The SkyCity was a large military fortress mounted on a kilometer-long stem. It was purchased secondhand by P'Pau'D'P'Pau, relocated to planet Shmul, and used to store military personnel and equipment as well as the Transatron. It was infiltrated by Jack T. Ladd and Narm N'Palm with the help of P'Pau'D'P'Pau's daughter Ruthie, and Ladd used a secret passage to access and steal the Transatron. The Transatron was damaged during a shooting spree by N'Palm, releasing vast amounts of energy which obliterated the SkyCity.