The Autobots and Decepticons have disbanded and returned to Cybertron. With the days of Optimus Prime and Megatron over, Cybertron is now ruled by a triumvirate. However, an ancient technology has enabled a new threat, the power for multiple Transformers to combine into one massive, dangerous form: Combiners. Who will stand-up to this threat to ensure that the fragile peace that was 4 million years in the making