The last and largest of the Autobot Micromaster Bases from its launch year is Countdown, who turns into a moon rover. His launch base is a rather elaborate playset that turns from a rocket launchpad to a battle station loaded with play features. All the Micromaster Bases can connect to one another, allowing for the creation of a sprawling Micromaster-scaled city. Countdown was released in 1989. It marks the last drawing of the 1989 toys, meaning the final year of Generation One toys starts with tomorrow's drawing.
The combined form of the Universe Micromaster Aerialbots is Superion, an amalgamation of six robots plus their pack-in accessories that serve as connectors, head, and extremities of the gestalt warrior. While in Japan, the original source of the design ( Sixwing , 1992) was available in a collected set, this combiner needed to be purchased one bot at a time in the 2007 Universe release.