When Orion Pax becomes the bearer of the Matrix of Leadership, he evolves to Optimus Prime. This Power of the Primes Leader Class Evolution Optimus Prime figure lets fans imagine creating that same legendary evolution. Use the included converting Evolution Armor to evolve from a 5.5-inch scale Deluxe Class Orion Pax figure to a 9-inch scale Leader Class Optimus Prime figure. It even includes a Matrix of Leadership accessory that fits inside the figure's chest. The Matrix of Leadership accessory also holds Prime Master figures (not included, each sold separately). Swap out the Matrix's core and swap in a Prime Master figure to imagine giving Optimus Prime the incredible godlike powers of a Prime. The Optimus Prime figure converts to tractor-trailer mode in 33 steps. The Orion Pax figure converts from vehicle to robot mode in 15 steps. See if you can master the detailed conversion of a Leader Class figure. Transformers and all related characters are trademarks of Hasbro.