Megatron came upon Optimus and challenged his old foe to a duel. Optimus managed to gain the upper hand, but hesitated to deliver the killing blow when he discovered that Megatron had married the Matrix to his spark, corrupting it. Several Decepticons then swarmed Optimus, allowing Megatron to blast a hole through his chest. Dead and defeated, Optimus plummeted down into the bowels of Cybertron. Pax Megatronus Rodimus and Duke travelled far beneath Cybertron, where they discovered Ultra Magnus- the Autobot god of death -carrying Optimus's body away. Earth: R.I.P.

The real selling point of the toy, however, is the colossal Omega Combat Armor. Optimus' trailer transforms into nearly two feet of limb extensions, armor, and wings. The armor remains completely integrated (except for the Ultimax Super Cannon) during transformation, with no partsforming, although this renders the final power-up robot mode somewhat limited in articulation, having no leg articulation whatsoever aside from swinging the hips out slightly and twisting at the ankles for maximum stability. The armor adds six more 5mm ports of dubious utility around the feet, retains the four from the cab robot and the eight from the trailer (on the backs of the wings), and has his own pair of 5mm fist holes. In trailer mode, it can support itself using folding blue landing gear, although the attached ball-jointed struts make it somewhat less than realistic.
During the war, Optimus was killed in battle by Megatron, but was eventually resurrected. The Fight Begins Coming to the dire realization that the war against the Decepticons had become a never-ending arms race, Optimus Prime challenged Megatron to single-combat, with their troops acting as witnesses to their terrible and final clash. The battle between both faction leaders ended with Megatron beaten down and goading Optimus into delivering the kill shot...
The TakaraTomy "Autobot Alliance" release of this toy has some significant differences, including casting the red plastic in a darker shade, making his shin and wheel joints grey rather than Hasbro's bronze, painting the Matrix of Leadership silver, and swapping out the dual energon swords for battle hooks, similar to 2010's Leader class Optimus Prime. However, due to the Japanese release retaining the Hasbro packaging, the box still advertises the dual energon swords rather than the hooks. He retains the masked face used for the Hasbro release.
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