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Appearing in "Call of the Primitives," Tornedron was apparently intended as a successor to Unicron]] and designed to consume all energy that it came across, rendering the life from which it took it inert. This prompted the gathering of the Primitives-various Autobots and Decepticons with animal-based alternate modes-to the planet where Primacron maintained his lab by the Oracle, Primacron's former assistant. When Tornedron turned on its creator, it defeated most of the primitives but was destroyed by the quick-thinking of Grimlock.
"Ask Vector Prime" revealed that in another reality Tornedron was successful in destroying its entire native universe, including Primacron.