Page "Matrix of Leadership" Paragraph 8

Before passing away, Prime spoke of a prophecy-one day, " The Chosen One " would rise from the ranks of the Autobots, and use the power of the Matrix to light the Transformers ' darkest hour.

That darkest hour soon came upon Cybertron in the form of the world-eater, Unicron, who knew that the Matrix's power was the one thing that could destroy him.

Recreating Decepticon leader Megatron as Galvatron, he dispatched him to destroy Ultra Magnus and the Matrix, but when Galvatron obtained the talisman, he tried and failed to use its power against Unicron.

Ultimately, the Chosen One who could open the Matrix proved to be the youthful Hot Rod, who reclaimed the Matrix and was reformatted by its power into Rodimus Prime, before opening it within Unicron and releasing its power, which tore Unicron apart from within.