Concluding this line of Walmart-exclusive Dinobots with Sludge. In this incarnation, Sludge turns into a sail-backed dimetrodon, which is technically not a dinosaur but we won't tell him that. He is a redeco of 1999 Japanese Beast Wars figure named Sling. Sludge was available in a two-pack with Snarl starting in 2003.
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.
