When Autobot Hot Rod is corrupted by the dark power of the Matrix of Chaos, he evolves to Rodimus Unicronus. Rodimus Unicronus, aka Rodimus Cron, operates as a weapon of chaos. He eliminates anyone who stands in his way without hesitation, and without regard for consequence. With the dark energy of Unicron following through his spark, Rodimus Cron fears no mortal and answers only to his master. Turned against all he once stood for, the Autobot formerly known as Hot Rod now lives for a single purpose: destroy the Matrix of Leadership and any bot who bears it.