This incarnation of Optimus Prime turns into a fire truck, a first for the Autobot leader but certainly not the last time for the heroic figure. Prime's cab turns into a basic robot (Fire Convoy, in Japan) which can combine with the trailer to form a larger sized robot (Super Fire Convoy). I drew the smaller bot as a sign-off to the last year of daily drawings, 2021, here.
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.
