If Hydra looks familiar, it's because the basic body shape has been used before, first as 1996's Terrorsaur and then as 1997's Lazorbeak and Fractyl. In all these examples, he turns into a pteranodon. Hydra is a Predacon bombardier, and was available in Japan in 1999.
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.
