Another BotCon 2007 exclusive, this edition of Overkill was available to participants of a customization class. The class instructed on how to turn this unassembled and unpainted Classics Grimlock into a version of the Generation 1 cassette, Overkill . Once completed, this Overkill turns into a Tyrannosaurus Rex. This design would be made "real" as part of a 2008 Universe toyline.
An Online Amateur Sketchpad