Call of the Primitives

The evil Primacron has plans for universal conquest. His means of this is Tornadron, who is possibly powerful enough to destroy every Transformer and whatever else gets in his way. Unaware of Primacron's machinations, the Autobots and the Decepticons are busy again fighting each other. Suddenly, however, a strange signal gets the more primitive Transformers' attention. These usual enemies ultimately find Primacron's own assistant, who explains the situation and requests their help against his master. If they can't work together, everything they know and more will be doomed.