Spinister is a complete and utter mystery to everyone, and that's just the way he likes it.  No one knows just why he sided with the Decepticons, but they've been reaping the rewards ever since.  When asked about his background he remains silent or threatens to destroy anyone who continues to probe him.  He enjoys toying with Autobots, softening them up before going in for the final kill.  Spinister recently surfaced again, showing up on Earth with Octopunch and Stranglehold, after having gone missing for twenty years.  As always, he doesn't discuss where he has been.  Nor has he offered any clues as to his recent body upgrade.  Spinister uses a unique cloaking system in his alt mode, which enabes him to sneak up on Autobots while avoiding detection.  He refuses to share the technology with his colleagues in case they decide to use it against him.