A hit squad of TRANSFORMERS from a parallel reality have come to CYBERTRON and EARTH, intent on destabilizing the local factions of AUTOBOTS and DECEPTICONS. With OPTIMUS PRIME missing, lost on an alternate CYBERTRON, MEGATRON attacks Autobase, decimating the AUTOBOT forces desperately protecting a trans-dimensional probe (designed to locate PRIME). But then, with total victory within his grasp, MEGATRON himself is attacked...