The Transformers Alliance or simply Transformers is an alliance between the Autobots and Decepticons formed by Decepticon leader Megatron.
Megatron became interested in the Transbio War, thinking about an alliance with the Toa Nuva to kill Optimus Prime. Instead, the Toa ended up fighting the Decepticons and Megatron allied with the Autobots, forming the Transformers. The Transformers killed Toa Gali Nuva and blasted the rest into space.
Ejector Takes Command
Optimus' failing health was not a surprise to most, since Bumblebee had nearly kicked his sweets off. His incessant pain made it impossible to lead, which lead Megatron to believe that he was going to be able to assimilate the Autobots into his army, turning the entire Transformers Alliance into Decepticons. He was wrong. Ultra Magnus and surprisingly Ejector stopped Megatron and each competed in an election to decide who would take Prime's place. The Decepticons and Skids ('cos he was coked up) voted for Ejector, making a majority. The Autobots knew that this was a bad sign, because now that Ejector had replaced Optimus, the Decepticons had full power over the Transformers. This lead Ultra Magnus to think...to contemplate the benefit of the alliance...or if there was any at all.
Soon, the alliance was no more. The Decepticons joined the Makuta and the Autobots joined the United Villages.