The collected form of the previous six 'bots -- the Protectobots merged into their combiner gestalt form of Defensor. To make this agglomeration work, you need a few extra parts that were included in the toy releases of the individual components. This design had been previously released as SixTurbo in Japan in 1992. This incarnation is the 2004 KB Toys exclusive edition.
An Online Amateur Sketchpad