"Micropolis, the building set that never stops growing," read the Mego catalog. There were 5 different Micropolis building sets released and the Galactic Command Center or GCC, was one of them. Released in 1978 as a very large boxed item, the city sets were designed to stimulate a childs creative ability, and at the same time, make their fingertips very sore! Based on the snap together building panels included with the Microman Build Base play set, the Micropolis city sets could be assembled in any configuration you could think up. The basic idea was to connect each panel with small gray connectors and build structures that resembled the ones on the packaging. Each set came with a large sized instruction sheet map that acted like blue prints for each building section. You could lay each panel out on the map, and then begin the arduous task of snapping each in onto each connector. Each panel contained roughly 12 5mm holes, and had small recessed surfaces to snap the square connectors into. The connectors had a small bend in them, and contained 4 dimples. The bend allowed the connector to fold over for corners or be rigid for walls, depending on which way you attached it to the panel piece. This was the "exclusive snap-action two-way Microhinge"!The GCC contained 2 basic structures, a mid-section and crane tower.
 
This particular set had 227 parts, and had these basic components: square panels, triangle panels, octagon panels, domes, chairs, and girders. The distinguishing feature of the GCC was the gray plastic winch, computer consoles and stair sections. The winch came with a snap together crank that fit onto the side, and pulled up the hook with the string on the inside. The Mego catalogs show different red stair sections and yellow girders, but the Micropolis city sets went through even more drastic changes upon final release.
  
prototype as shown in pamphlet

In the Micronaut pamphlets released in 1977, the initial prototypes were shown, and then quickly changed in the catalogs as they decided on a final design, undoubtedly to maximize repackaging the same parts as different sets.

This use of repackaging was used for the figures as well, only they were in different colors. This set also included a small plastic accessory tree, which contained 22 different connectors. The Micropolis building sets did however look very cool and space aged when built, and were hours of fun…because they usually took hours to assemble!