A small subset of Headmasters from 1987 were the Headmaster Horrorcons, triple changers that went from beast, to robot, to vehicle mode. The Headmaster unit forms the robot head as well as the beast head. In this case, Ape Face turns from robot to gorilla, to a Cybertronian jet fighter to a robot. His Headmaster unit (inset) is Spasma.
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.