- The Cybertron Alliance was a truce made during the Japanese version of Generation 2.
After Optimus Prime and Megatron had been resurrected to battle each other, the two eventually settled on a truce. The new Cybertron Alliance would not only end hostilities between Autobots and Decepticons, but would usher in the Second Generation of the Transformers.
It would not last long. After an incident where Earthlings killed a Decepticon, Megatron called off the truce in a fit of rage and the Generation 2 battles began.
While the Alliance lasted, Autobots and Decepticons both wore a previously unseen symbol that combined elements of their individual sigils. The symbol bears a heavy resemblance to the proto-faction insignia discovered by Shockwave in the G1 Dreamwave comic.